Fix typo

area for scrollbar (area.len() == 1)

.forgejo/workflows/pre-release.yaml

@@ -159,26 +159,20 @@ jobs:
 
             ### 🚀 How to use
             #### Linux/ARM:
-            ```bash
                 # Download the appropriate binary
                 wget https://your-forgejo.com/releases/download/${{ forgejo.ref_name }}/uptime-kuma-dashboard-<your-target>
                 # Make executable
                 chmod +x uptime-kuma-dashboard-*
                 # Run
                 ./uptime-kuma-dashboard-* --base-url https://your-kuma --slug your-slug
-            ```
 
             #### Windows:
-            ```powershell
                 # Download uptime-kuma-dashboard-x86_64-pc-windows-gnu.exe
                 # Run in PowerShell or CMD
                 .\uptime-kuma-dashboard-x86_64-pc-windows-gnu.exe --base-url https://your-kuma --slug your-slug
-            ```
 
             ### ✅ Verify Checksums
-            ```bash
                 sha256sum -c SHA256SUMS.txt
-            ```
 
             ### 🏗️ Build Information
             - Rust Version: ${{ steps.rust-version.outputs.version }}

.forgejo/workflows/release.yaml

@@ -0,0 +1,179 @@
+name: Multi-Platform Release Build
+on:
+  push:
+    tags:
+      - "v*.*.*"
+jobs:
+  build:
+    runs-on: docker
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - target: native
+            cross: false
+            platform: linux/arm64
+
+          - target: x86_64-unknown-linux-gnu
+            cross: true
+            platform: linux/amd64
+            deps: "build-essential gcc-x86-64-linux-gnu libc6-dev-amd64-cross pkg-config binutils-x86-64-linux-gnu"
+            env:
+              CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER: x86_64-linux-gnu-gcc
+
+          - target: x86_64-pc-windows-gnu
+            cross: true
+            platform: linux/amd64
+            deps: "gcc-mingw-w64-x86-64 g++-mingw-w64-x86-64 cmake nasm"
+            env:
+              CC_x86_64_pc_windows_gnu: x86_64-w64-mingw32-gcc
+              CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER: x86_64-w64-mingw32-gcc
+
+    steps:
+      - name: Checkout code
+        uses: https://code.forgejo.org/actions/checkout@v4
+
+      - name: Setup Rust
+        uses: https://github.com/dtolnay/rust-toolchain@stable
+        with:
+          toolchain: stable
+
+      - name: Cache Rust dependencies
+        uses: https://code.forgejo.org/actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-${{ matrix.target }}-
+            ${{ runner.os }}-cargo-
+
+      - name: Native Build Release
+        if: matrix.target == 'native'
+        run: |
+          NATIVE_TARGET=$(rustc -vV | grep 'host:' | cut -d' ' -f2)
+          echo "Building for native target: $NATIVE_TARGET"
+          cargo build --release
+          TARGET_BINARY="target/release/uptime-kuma-dashboard"
+          OUTPUT_NAME="uptime-kuma-dashboard-$NATIVE_TARGET"
+          mkdir -p release-artifacts
+          cp "$TARGET_BINARY" "release-artifacts/$OUTPUT_NAME"
+          strip "release-artifacts/$OUTPUT_NAME" 2>/dev/null || true
+          chmod +x "release-artifacts/$OUTPUT_NAME"
+          ls -lh "release-artifacts/$OUTPUT_NAME"
+
+      - name: Get Rust version
+        id: rust-version
+        run: echo "version=$(rustc --version | cut -d' ' -f2)" >> $GITHUB_OUTPUT
+
+      - name: Cross-Build Linux x86_64 Release
+        if: matrix.target == 'x86_64-unknown-linux-gnu'
+        uses: docker://rust:slim
+        with:
+          args: >
+            sh -c "
+            rustup target add ${{ matrix.target }} &&
+            apt-get update && apt-get install -y ${{ matrix.deps }} &&
+            mkdir -p ~/.cargo &&
+            echo '[target.${{ matrix.target }}]\nlinker = \"x86_64-linux-gnu-gcc\"' > ~/.cargo/config.toml &&
+            cargo build --release --target ${{ matrix.target }} &&
+            mkdir -p release-artifacts &&
+            cp target/${{ matrix.target }}/release/uptime-kuma-dashboard release-artifacts/uptime-kuma-dashboard-${{ matrix.target }} &&
+            x86_64-linux-gnu-strip release-artifacts/uptime-kuma-dashboard-${{ matrix.target }} &&
+            chmod +x release-artifacts/uptime-kuma-dashboard-${{ matrix.target }}"
+        env: ${{ matrix.env }}
+        options: --platform ${{ matrix.platform }}
+
+      - name: Cross-Build Windows x86_64 Release
+        if: matrix.target == 'x86_64-pc-windows-gnu'
+        uses: docker://rust:slim
+        with:
+          args: >
+            sh -c "
+            rustup target add ${{ matrix.target }} &&
+            apt-get update && apt-get install -y ${{ matrix.deps }} &&
+            cargo build --release --target ${{ matrix.target }} &&
+            mkdir -p release-artifacts &&
+            cp target/${{ matrix.target }}/release/uptime-kuma-dashboard.exe release-artifacts/uptime-kuma-dashboard-${{ matrix.target }}.exe &&
+            ls -lh release-artifacts/"
+        env: ${{ matrix.env }}
+        options: --platform ${{ matrix.platform }}
+
+      - name: Upload artifacts
+        uses: https://data.forgejo.org/forgejo/upload-artifact@v4
+        with:
+          name: binary-${{ matrix.target }}
+          path: release-artifacts/
+          retention-days: 1
+
+  create-release:
+    runs-on: docker
+    needs: build
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout code
+        uses: https://code.forgejo.org/actions/checkout@v4
+
+      - name: Download all artifacts
+        uses: https://data.forgejo.org/forgejo/download-artifact@v4
+        with:
+          path: all-artifacts/
+
+      - name: Prepare release artifacts
+        run: |
+          mkdir -p release-artifacts
+          find all-artifacts -type f -name "uptime-kuma-dashboard-*" -exec cp {} release-artifacts/ \;
+          ls -lh release-artifacts/
+
+      - name: Generate checksums
+        run: |
+          cd release-artifacts
+          sha256sum uptime-kuma-dashboard-* > SHA256SUMS.txt
+          cat SHA256SUMS.txt
+
+      - name: Create Release
+        uses: https://code.forgejo.org/actions/forgejo-release@v2
+        with:
+          direction: upload
+          url: https://git.marcodearaujo.com
+          repo: marcodearaujo/uptime-kuma-dashboard
+          token: ${{ secrets.FORGEJO_TOKEN }}
+          release-dir: release-artifacts
+          title: "Release ${{ forgejo.ref_name }}"
+          tag: ${{ forgejo.ref_name }}
+          release-notes: |
+            ## 🚀 Multi-Platform Release
+            Compiled on Forgejo Runner **${{ runner.arch }}**
+
+            ### 📦 Available Binaries
+            This release includes binaries for the following platforms:
+            - **Linux x86_64** (Intel/AMD 64-bit)
+            - **Linux ARM64** (aarch64) - Raspberry Pi 4, ARM servers
+            - **Windows x86_64** (64-bit)
+
+            ### 🚀 How to use
+            #### Linux/ARM:
+                # Download the appropriate binary
+                wget https://your-forgejo.com/releases/download/${{ forgejo.ref_name }}/uptime-kuma-dashboard-<your-target>
+                # Make executable
+                chmod +x uptime-kuma-dashboard-*
+                # Run
+                ./uptime-kuma-dashboard-* --base-url https://your-kuma --slug your-slug
+
+            #### Windows:
+                # Download uptime-kuma-dashboard-x86_64-pc-windows-gnu.exe
+                # Run in PowerShell or CMD
+                .\uptime-kuma-dashboard-x86_64-pc-windows-gnu.exe --base-url https://your-kuma --slug your-slug
+
+            ### ✅ Verify Checksums
+                sha256sum -c SHA256SUMS.txt
+
+            ### 🏗️ Build Information
+            - Rust Version: ${{ steps.rust-version.outputs.version }}
+            - Build Date: $(date +'%Y-%m-%d')
+            - Build Type: Release (optimized with LTO)

Cargo.lock

@@ -78,9 +78,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.100"
+version = "1.0.101"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
+checksum = "5f0e0fee31ef5ed1ba1316088939cea399010ed7731dba877ed44aeb407a75ea"
 
 [[package]]
 name = "atomic"
@@ -236,9 +236,9 @@ checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
 
 [[package]]
 name = "chrono"
-version = "0.4.42"
+version = "0.4.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "145052bdd345b87320e369255277e3fb5152762ad123a901ef5c262dd38fe8d2"
+checksum = "fac4744fb15ae8337dc853fee7fb3f4e48c0fbaa23d0afe49c447b4fab126118"
 dependencies = [
  "iana-time-zone",
  "js-sys",
@@ -249,9 +249,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.54"
+version = "4.5.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6e6ff9dcd79cff5cd969a17a545d79e84ab086e444102a591e288a8aa3ce394"
+checksum = "6899ea499e3fb9305a65d5ebf6e3d2248c5fab291f300ad0a704fbe142eae31a"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -259,9 +259,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.54"
+version = "4.5.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa42cf4d2b7a41bc8f663a7cab4031ebafa1bf3875705bfaf8466dc60ab52c00"
+checksum = "7b12c8b680195a62a8364d16b8447b01b6c2c8f9aaf68bee653be34d4245e238"
 dependencies = [
  "anstream",
  "anstyle",
@@ -271,9 +271,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.49"
+version = "4.5.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0b5487afeab2deb2ff4e03a807ad1a03ac532ff5a2cee5d86884440c7f7671"
+checksum = "a92793da1a46a5f2a02a6f4c46c6496b28c43638adea8306fcb0caa1634f24e5"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -1955,9 +1955,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.35"
+version = "0.23.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "533f54bc6a7d4f647e46ad909549eda97bf5afc1585190ef692b4286b198bd8f"
+checksum = "c665f33d38cea657d9614f766881e4d510e0eda4239891eea56b4cadcf01801b"
 dependencies = [
  "aws-lc-rs",
  "once_cell",
@@ -2132,9 +2132,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.148"
+version = "1.0.149"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3084b546a1dd6289475996f182a22aba973866ea8e8b02c51d9f46b1336a22da"
+checksum = "83fc039473c5595ace860d8c4fafa220ff474b3fc6bfdb4293327f1a37e94d86"
 dependencies = [
  "itoa",
  "memchr",
@@ -2668,7 +2668,7 @@ checksum = "8ecb6da28b8a351d773b68d5825ac39017e680750f980f3a1a85cd8dd28a47c1"
 
 [[package]]
 name = "uptime-kuma-dashboard"
-version = "0.1.0"
+version = "0.38.2"
 dependencies = [
  "anyhow",
  "chrono",
@@ -2689,9 +2689,9 @@ dependencies = [
 
 [[package]]
 name = "url"
-version = "2.5.7"
+version = "2.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08bc136a29a3d1758e07a9cca267be308aeebf5cfd5a10f3f67ab2097683ef5b"
+checksum = "ff67a8a4397373c3ef660812acab3268222035010ab8680ec4215f38ba3d0eed"
 dependencies = [
  "form_urlencoded",
  "idna",

Cargo.toml

@@ -1,28 +1,28 @@
 [package]
 name = "uptime-kuma-dashboard"
-version = "0.1.0"
+version = "0.38.2"
 edition = "2024"
 
 [dependencies]
-clap = { version = "4.5.54", features = ["derive", "env"] }
+clap = { version = "4.5.57", features = ["derive", "env"] }
 reqwest = { version = "0.13.1", default-features = false, features = [
     "blocking",
     "json",
     "rustls",
 ] }
-anyhow = "1.0"
+anyhow = "1.0.101"
 fluent-templates = "0.13.2"
 unic-langid = "0.9.6"
 sys-locale = "0.3.2"
 serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0.148"
+serde_json = "1.0.149"
 once_cell = "1.19"
-url = "2.5.7"
+url = "2.5.8"
 ratatui = "0.30.0"
 crossterm = "0.29.0"
-chrono = "0.4.42"
+chrono = "0.4.43"
 rayon = "1.11.0"
-rustls = { version = "0.23.35", default-features = false, features = ["ring"] }
+rustls = { version = "0.23.36", default-features = false, features = ["ring"] }
 
 [features]
 default = []

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Marco De Araujo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,145 @@
+# Uptime Kuma Terminal Dashboard
+
+![Terminal Dashboard Preview](https://img.shields.io/badge/Rust-1.76+-orange?style=flat-square&logo=rust)
+
+A terminal-based monitoring dashboard for Uptime Kuma that displays service status, uptime percentages, and historical performance data directly in your terminal. Built with Rust for performance and reliability.
+
+## Demo
+
+<video width="800" controls>
+  <source src="assets/demo.webm" type="video/webm">
+  Your browser does not support the video tag.
+</video>
+
+## Overview
+
+This personal project started as a way to monitor my home lab services without needing a web browser. It connects to your Uptime Kuma instance API and presents a clean, color-coded view of your services' status with real-time updates. The dashboard works great on servers, remote terminals, or anywhere you prefer a lightweight monitoring solution.
+
+Perfect for DevOps engineers, system administrators, or anyone who prefers terminal workflows over web interfaces for quick status checks.
+
+## Features
+
+- Real-time service monitoring with automatic refresh
+- Color-coded status indicators (green for up, red for down)
+- Historical uptime visualization with compact status history lines
+- Responsive terminal UI that adapts to window size
+- Internationalization support (English and Portuguese)
+- Configurable refresh intervals
+- Minimal resource usage (runs efficiently even on low-power devices)
+- Keyboard navigation support (arrow keys, home/end)
+- Mobile-friendly design for SSH connections
+
+## Tech Stack
+
+This project demonstrates proficiency with several modern technologies:
+
+- **Rust** (core language with async capabilities)
+- **ratatui** (terminal UI framework)
+- **reqwest** (HTTP client for API communication)
+- **serde** (JSON serialization/deserialization)
+- **clap** (command-line argument parsing)
+- **fluent-templates** (internationalization framework)
+- REST API integration patterns
+- Error handling and logging best practices
+- Cross-platform terminal development
+
+You can find the latest releases in the [Releases section](https://git.marcodearaujo.com/marcodearaujo/uptime-kuma-dashboard/releases).
+
+## Installation
+
+### Option 1: Download built Binary (Recommended)
+
+1. Go to the [Releases page](https://git.marcodearaujo.com/marcodearaujo/uptime-kuma-dashboard/releases)
+2. Download the binary for your operating system:
+   - **Linux (x86_64)**: `uptime-kuma-dashboard-x86_64-unknown-linux-gnu`
+   - **Linux (ARM64)**: `uptime-kuma-dashboard-aarch64-unknown-linux-gnu` (Raspberry Pi, ARM servers)
+   - **Windows**: `uptime-kuma-dashboard-x86_64-pc-windows-gnu.exe`
+3. Verify the checksum (recommended for security):
+   ```bash
+   sha256sum -c SHA256SUMS.txt
+   ```
+4. Make it executable (Linux/ARM only):
+   ```bash
+   chmod +x uptime-kuma-dashboard-*
+   ```
+5. Run with your parameters:
+   ```bash
+   ./uptime-kuma-dashboard-* --base-url="http://your-kuma:3001/" --slug="your-slug"
+   ```
+
+### Option 2: Build From Source
+
+### Prerequisites
+
+- Rust 1.74+ toolchain (install via [rustup](https://rustup.rs/))
+- Uptime Kuma instance with API access
+
+### Build from Source
+
+```bash
+# Clone the repository
+git clone https://git.marcodearaujo.com/marcodearaujo/uptime-kuma-dashboard.git
+cd uptime-kuma-dashboard
+
+# Build the project
+cargo build --release
+
+# Run the dashboard (replace with your Uptime Kuma URL and status page slug)
+./target/release/uptime-kuma-dashboard \
+  --base-url="http://your-uptime-kuma-instance:3001/" \
+  --slug="your-status-page-slug"
+```
+
+## Usage
+
+The dashboard requires two parameters:
+
+- `--base-url`: Your Uptime Kuma instance URL (including port)
+- `--slug`: Your status page slug identifier
+
+Example:
+
+```bash
+./uptime-kuma-dashboard --base-url="http://192.168.1.100:3001/" --slug="home-services"
+```
+
+**Controls during runtime:**
+
+- `q` or `ESC`: Exit the dashboard
+- `↑`/`↓` or `k`/`j`: Navigate through monitors
+- `Home`/`End`: Jump to top/bottom of the list
+
+## Configuration
+
+You can set environment variables to avoid typing parameters each time:
+
+```bash
+export UPTIME_KUMA_URL="http://your-uptime-kuma-instance:3001/"
+export STATUS_PAGE_SLUG="your-status-page-slug"
+```
+
+## Development Notes
+
+This project follows Rust best practices including:
+
+- Comprehensive error handling with `anyhow`
+- Internationalization-ready architecture
+- Modular code organization
+- Performance optimization for terminal rendering
+- Cross-platform compatibility testing
+
+The architecture separates concerns into:
+
+- API client layer
+- Data processing core
+- UI rendering components
+- Configuration management
+- Internationalization system
+
+## License
+
+This project is available under the MIT License - see the [LICENSE](LICENSE) file for details.
+
+---
+
+_Developed as a personal learning project to improve Rust skills and create a useful tool for my home lab monitoring. Feedback welcome!_

src/api/client.rs

@@ -1,9 +1,11 @@
+use std::time::Duration;
+
 use anyhow::Result;
 use reqwest::blocking::Client;
 
 use crate::{
     api::endpoints::UptimeKumaEndpoints,
-    data::{self, heartbeat::HeartbeatResponse, status_page::model::StatusPageResponse},
+    data::{self, heartbeat::HeartbeatResponse, status_page::model::StatusPageResponse}, i18n::t,
 };
 
 #[derive(Debug, Clone)]
@@ -13,8 +15,9 @@ pub struct UptimeKumaClient {
 
 impl UptimeKumaClient {
     pub fn new() -> Self {
+        let client = Client::builder().connect_timeout(Duration::from_secs(10)).timeout(Duration::from_secs(30)).build().unwrap_or_else(|_| panic!("{}", t("http-build-error")));
         Self {
-            client: Client::new(),
+            client,
         }
     }
 

src/core/data.rs

@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::collections::HashMap;
 
 use crate::core::models::{UnifiedData, UnifiedGroupData, UnifiedMonitorData};
@@ -6,32 +7,45 @@ use crate::data::{
     status_page::model::StatusPageResponse,
 };
 
-pub fn unify_data(status_page: &StatusPageResponse, heartbeat: &HeartbeatResponse) -> UnifiedData {
+pub fn unify_data<'a>(
+    status_page: &'a StatusPageResponse,
+    heartbeat: &'a HeartbeatResponse,
+) -> UnifiedData<'a> {
     let mut groups = Vec::with_capacity(status_page.public_group_list.len());
-    let heartbeat_map: HashMap<u64, Vec<HeartbeatEntry>> = heartbeat
+
+    let mut heartbeat_map: HashMap<u64, &'a [HeartbeatEntry]> =
+        HashMap::with_capacity(heartbeat.monitors.len());
+    heartbeat_map.extend(
+        heartbeat
             .monitors
             .iter()
-        .map(|m| (m.monitor_id, m.heartbeats.clone()))
+            .map(|m| (m.monitor_id, &m.heartbeats[..])),
-        .collect();
+    );
 
-    let uptime_map: HashMap<(u64, u32), UptimeData> = heartbeat
+    let mut uptime_map: HashMap<(u64, u32), &'a UptimeData> =
+        HashMap::with_capacity(heartbeat.uptime_data.len());
+    uptime_map.extend(
+        heartbeat
             .uptime_data
             .iter()
-        .map(|u| ((u.monitor_id, u.period_hours), u.clone()))
+            .map(|u| ((u.monitor_id, u.period_hours), u)),
-        .collect();
+    );
 
     for group in &status_page.public_group_list {
         let mut monitors = Vec::with_capacity(group.monitor_list.len());
         for monitor_info in &group.monitor_list {
-            let uptime_data = uptime_map.get(&(monitor_info.id, 24)).cloned();
+            let uptime_data = uptime_map.get(&(monitor_info.id, 24)).copied();
-            let heartbeats = heartbeat_map
+            let heartbeats = heartbeat_map.get(&monitor_info.id).copied().unwrap_or(&[]);
-                .get(&monitor_info.id)
+
-                .cloned()
+            let name: Cow<'a, str> = if monitor_info.name.len() > 100 {
-                .unwrap_or_default();
+                Cow::Owned(monitor_info.name.clone())
+            } else {
+                Cow::Borrowed(monitor_info.name.as_str())
+            };
 
             monitors.push(UnifiedMonitorData {
                 id: monitor_info.id,
-                name: monitor_info.name.clone(),
+                name,
                 heartbeats,
                 uptime_data,
             });
@@ -40,7 +54,7 @@ pub fn unify_data(status_page: &StatusPageResponse, heartbeat: &HeartbeatRespons
         monitors.sort_by_key(|m| m.id);
 
         groups.push(UnifiedGroupData {
-            group_info: group.clone(),
+            group_info: group,
             monitors,
         });
     }
@@ -48,8 +62,8 @@ pub fn unify_data(status_page: &StatusPageResponse, heartbeat: &HeartbeatRespons
     groups.sort_by_key(|g| g.group_info.weight);
 
     UnifiedData {
-        title: status_page.config.title.clone(),
+        title: Cow::Borrowed(&status_page.config.title),
-        description: status_page.config.description.clone(),
+        description: status_page.config.description.as_deref().map(Cow::Borrowed),
         groups,
         auto_refresh_interval: status_page.config.auto_refresh_interval,
     }

src/core/models.rs

@@ -1,24 +1,26 @@
+use std::borrow::Cow;
+
 use crate::data::heartbeat::model::{HeartbeatEntry, UptimeData};
 use crate::data::status_page::model::{StatusPageGroup};
 
 #[derive(Debug, Clone)]
-pub struct UnifiedMonitorData {
+pub struct UnifiedMonitorData<'a> {
     pub id: u64,
-    pub name: String,
+    pub name: Cow<'a, str>,
-    pub heartbeats: Vec<HeartbeatEntry>,
+    pub heartbeats: &'a [HeartbeatEntry],
-    pub uptime_data: Option<UptimeData>,
+    pub uptime_data: Option<&'a UptimeData>,
 }
 
 #[derive(Debug, Clone)]
-pub struct UnifiedData {
+pub struct UnifiedData<'a> {
-    pub title: String,
+    pub title: Cow<'a, str>,
-    pub description: Option<String>,
+    pub description: Option<Cow<'a, str>>,
     pub auto_refresh_interval: u32,
-    pub groups: Vec<UnifiedGroupData>,
+    pub groups: Vec<UnifiedGroupData<'a>>,
 }
 
 #[derive(Debug, Clone)]
-pub struct UnifiedGroupData {
+pub struct UnifiedGroupData<'a> {
-    pub group_info: StatusPageGroup,
+    pub group_info: &'a StatusPageGroup,
-    pub monitors: Vec<UnifiedMonitorData>,
+    pub monitors: Vec<UnifiedMonitorData<'a>>,
 }

src/data/heartbeat/model.rs

@@ -55,7 +55,7 @@ impl HeartbeatResponse {
         for (monitor_id_str, heartbeats) in &self.heartbeat_list_raw {
             let monitor_id = monitor_id_str
                 .parse::<u64>()
-                .with_context(|| format!("{}", t("invalid-monitor-id")))?;
+                .with_context(|| t("invalid-monitor-id").to_string())?;
 
             self.monitors.push(MonitorHeartbeats {
                 monitor_id,
@@ -77,11 +77,11 @@ impl HeartbeatResponse {
 
             let monitor_id = parts[0]
                 .parse::<u64>()
-                .with_context(|| format!("{}", t("invalid-monitor-id")))?;
+                .with_context(|| t("invalid-monitor-id").to_string())?;
 
             let period_hours = parts[1]
                 .parse::<u32>()
-                .with_context(|| format!("{}", t("invalid-period-hours")))?;
+                .with_context(|| t("invalid-period-hours").to_string())?;
 
             self.uptime_data.push(UptimeData {
                 monitor_id,

src/data/heartbeat/parser.rs

@@ -3,8 +3,8 @@ use crate::i18n::t;
 use anyhow::{Context, Ok, Result};
 
 pub fn parse_response(json_text: &str) -> Result<HeartbeatResponse> {
-    let mut response: HeartbeatResponse =
+    let mut response: HeartbeatResponse = serde_json::from_slice(json_text.as_bytes())
-        serde_json::from_str(json_text).with_context(|| t("invalid-json-heartbeat"))?;
+        .with_context(|| t("invalid-json-heartbeat"))?;
 
     response.process()?;
     Ok(response)

src/data/status_page/parser.rs

@@ -3,7 +3,7 @@ use crate::i18n::t;
 use anyhow::{Context, Ok, Result};
 
 pub fn parse_response(json_text: &str) -> Result<StatusPageResponse> {
-    let response: StatusPageResponse =
+    let response: StatusPageResponse = serde_json::from_slice(json_text.as_bytes())
-        serde_json::from_str(json_text).with_context(|| t("invalid-json-status-page"))?;
+        .with_context(|| t("invalid-json-status-page"))?;
     Ok(response)
 }

src/i18n/translate.rs

@@ -34,7 +34,7 @@ pub fn t(key: &str) -> String {
         }
     }
 
-    let result = LOCALES.lookup(&*get_system_locale(), key);
+    let result = LOCALES.lookup(get_system_locale(), key);
 
     let mut cache_write = cache.write().unwrap();
 
@@ -51,5 +51,5 @@ pub fn t_with_args(key: &str, args: &HashMap<&'static str, String>) -> String {
     for (key, value) in args {
         map.insert(Cow::Borrowed(*key), FluentValue::from(value));
     }
-    LOCALES.lookup_with_args(&get_system_locale(), key, &map)
+    LOCALES.lookup_with_args(get_system_locale(), key, &map)
 }

src/ui/app.rs

@@ -1,12 +1,10 @@
 use crate::api::{UptimeKumaClient, UptimeKumaEndpoints};
 use crate::core;
-use crate::data::{heartbeat::HeartbeatResponse, status_page::model::StatusPageResponse};
 use crate::i18n::{t, t_with_args};
 use crate::ui::{
     components::{render_footer, render_header, render_monitor_list},
     dashboard::model::DashboardViewState,
 };
-use anyhow::Result;
 use crossterm::{
     event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyEventKind},
     execute,
@@ -18,23 +16,18 @@ use ratatui::{
     layout::{Alignment, Constraint, Direction, Layout, Rect},
     style::{Color, Modifier, Style},
     text::{Line, Span, Text},
-    widgets::{Block, Borders, Padding, Paragraph},
+    widgets::{Block, Borders, Padding, Paragraph, Scrollbar, ScrollbarOrientation},
 };
 
 use std::{
     collections::HashMap,
     io,
-    sync::mpsc,
-    thread,
     time::{Duration, Instant},
 };
 
 const INITIAL_INTERVAL: u32 = 300;
-
+const MAIN_LAYOUT_WITH_SCROLLBAR: [Constraint; 2] = [Constraint::Min(1), Constraint::Length(1)];
-enum FetchResult {
+const MAIN_LAYOUT_WITHOUT_SCROLLBAR: [Constraint; 1] = [Constraint::Min(1)];
-    Heartbeat(Result<HeartbeatResponse>),
-    StatusPage(Result<StatusPageResponse>),
-}
 
 pub struct App {
     state: DashboardViewState,
@@ -47,6 +40,26 @@ pub struct App {
 }
 
 impl App {
+    pub fn new(endpoints: UptimeKumaEndpoints) -> io::Result<Self> {
+        let backend = CrosstermBackend::new(io::stdout());
+        let mut terminal = Terminal::new(backend)?;
+        terminal.hide_cursor()?;
+
+        let state = DashboardViewState::new();
+
+        let initial_interval = Duration::from_secs(INITIAL_INTERVAL as u64);
+
+        Ok(Self {
+            state,
+            terminal,
+            should_quit: false,
+            last_update: Instant::now(),
+            update_interval: initial_interval,
+            endpoints,
+            client: UptimeKumaClient::new(),
+        })
+    }
+
     fn setup_terminal(&mut self) -> io::Result<()> {
         enable_raw_mode()?;
         execute!(io::stdout(), EnterAlternateScreen, EnableMouseCapture)?;
@@ -116,53 +129,103 @@ impl App {
     fn render(&mut self) {
         let _ = self.terminal.draw(|frame| {
             let area = frame.area();
+
+            const HEADER_HEIGHT: u16 = 3;
+            const FOOTER_HEIGHT: u16 = 3;
+
+            let max_content_height = area.height.saturating_sub(HEADER_HEIGHT + FOOTER_HEIGHT);
+
             let chunks = Layout::default()
                 .direction(Direction::Vertical)
                 .margin(1)
                 .constraints([
-                    Constraint::Length(3),
+                    Constraint::Length(HEADER_HEIGHT),
-                    Constraint::Min(1),
+                    Constraint::Length(max_content_height.max(1)),
-                    Constraint::Length(3),
+                    Constraint::Length(FOOTER_HEIGHT),
                 ])
                 .split(area);
 
             render_header(frame, chunks[0], &self.state);
 
-            if self.state.is_loading {
+            let main_constraint = if self.state.show_vertical_scrollbar(chunks[1].height) {
-                Self::render_loading(frame, chunks[1]);
+                &MAIN_LAYOUT_WITH_SCROLLBAR[..]
-            } else if let Some(error) = &self.state.error_message {
-                Self::render_error(frame, chunks[1], error);
-            } else if self.state.groups.is_empty() || self.state.get_all_monitors().is_empty() {
-                Self::render_no_data(frame, chunks[1]);
             } else {
-                render_monitor_list(frame, chunks[1], &self.state);
+                &MAIN_LAYOUT_WITHOUT_SCROLLBAR[..]
+            };
+
+            let main_chunks = Layout::default()
+                .direction(Direction::Horizontal)
+                .constraints(main_constraint)
+                .split(chunks[1]);
+
+            if self.state.is_loading {
+                Self::render_loading(frame, main_chunks[0]);
+            } else if let Some(error) = &self.state.error_message {
+                Self::render_error(frame, main_chunks[0], error);
+            } else if self.state.groups.is_empty() || self.state.get_all_monitors().is_empty() {
+                Self::render_no_data(frame, main_chunks[0]);
+            } else {
+                Self::render_main(frame, main_chunks.to_vec(), &mut self.state);
             }
 
             let seconds_until_update = self
                 .update_interval
                 .checked_sub(self.last_update.elapsed())
-                .map(|d| d.as_secs() as u64)
+                .map(|d| d.as_secs())
                 .unwrap_or(30);
 
             render_footer(frame, chunks[2], seconds_until_update);
         });
     }
 
+    fn render_main(frame: &mut Frame, area: Vec<Rect>, state: &mut DashboardViewState) {
+        render_monitor_list(frame, area[0], state);
+
+        if !state.show_vertical_scrollbar(area[0].height) {
+            return;
+        }
+
+        if area.len() <= 1 {
+            dbg!(area[0].height);
+            return;
+        }
+
+        let max_scroll = state
+            .get_total_length()
+            .saturating_sub(area[0].height as usize)
+            .saturating_add(1);
+
+        state.scroll_state = state
+            .scroll_state
+            .content_length(max_scroll.max(1))
+            .viewport_content_length(area[0].height as usize);
+
+        let scrollbar = Scrollbar::new(ScrollbarOrientation::VerticalRight)
+            .begin_symbol(Some("↑"))
+            .end_symbol(Some("↓"));
+
+        frame.render_stateful_widget(scrollbar, area[1], &mut state.scroll_state);
+    }
+
     fn handle_events(&mut self) -> io::Result<()> {
         let timeout = Duration::from_secs(1);
 
-        if event::poll(timeout)? {
+        if event::poll(timeout)?
-            if let Event::Key(key) = event::read()? {
+            && let Event::Key(key) = event::read()?
+        {
             if key.kind == KeyEventKind::Release {
                 return Ok(());
             }
 
             match key.code {
                 KeyCode::Char('q') | KeyCode::Esc => self.should_quit = true,
+                KeyCode::Up | KeyCode::Char('k') => self.state.scroll_state.prev(),
+                KeyCode::Down | KeyCode::Char('j') => self.state.scroll_state.next(),
+                KeyCode::Home => self.state.scroll_state.first(),
+                KeyCode::End => self.state.scroll_state.last(),
                 _ => {}
             }
         }
-        }
         Ok(())
     }
 
@@ -180,7 +243,6 @@ impl App {
 
     fn refresh_data(&mut self) -> io::Result<()> {
         self.state.is_loading = true;
-        self.render();
 
         match self.fetch_and_update_data() {
             Ok(()) => {
@@ -197,57 +259,11 @@ impl App {
         Ok(())
     }
 
-    pub fn new(endpoints: UptimeKumaEndpoints) -> io::Result<Self> {
-        let backend = CrosstermBackend::new(io::stdout());
-        let mut terminal = Terminal::new(backend)?;
-        terminal.hide_cursor()?;
-
-        let state = DashboardViewState::new();
-
-        let initial_interval = Duration::from_secs(INITIAL_INTERVAL as u64);
-
-        Ok(Self {
-            state,
-            terminal,
-            should_quit: false,
-            last_update: Instant::now(),
-            update_interval: initial_interval,
-            endpoints,
-            client: UptimeKumaClient::new(),
-        })
-    }
-
     fn fetch_and_update_data(&mut self) -> anyhow::Result<()> {
-        let (tx, rx) = mpsc::channel();
+        let heartbeat_result = self.client.fetch_heartbeat(&self.endpoints)?;
+        let status_page_result = self.client.fetch_status_page(&self.endpoints)?;
 
-        let heartbeat_client = self.client.clone();
+        let unified_data = core::unify_data(&status_page_result, &heartbeat_result);
-        let heartbeat_endpoints = self.endpoints.clone();
-        let tx_clone = tx.clone();
-        thread::spawn(move || {
-            let result = heartbeat_client.fetch_heartbeat(&heartbeat_endpoints);
-            tx.send(FetchResult::Heartbeat(result)).unwrap();
-        });
-
-        let status_page_client = self.client.clone();
-        let status_page_endpoints = self.endpoints.clone();
-
-        thread::spawn(move || {
-            let result = status_page_client.fetch_status_page(&status_page_endpoints);
-            tx_clone.send(FetchResult::StatusPage(result)).unwrap();
-        });
-
-        let mut heartbeat_result = None;
-        let mut status_page_result = None;
-
-        for _ in 0..2 {
-            match rx.recv()? {
-                FetchResult::Heartbeat(result) => heartbeat_result = Some(result?),
-                FetchResult::StatusPage(result) => status_page_result = Some(result?),
-            }
-        }
-        let heartbeat_data = heartbeat_result.unwrap();
-        let status_page_data = status_page_result.unwrap();
-        let unified_data = core::unify_data(&status_page_data, &heartbeat_data);
         self.state = DashboardViewState::from_unified_data(unified_data);
         Ok(())
     }

src/ui/components/footer.rs

@@ -9,7 +9,11 @@ use ratatui::{
 use crate::i18n::t;
 use chrono::Local;
 
-pub fn render_footer(frame: &mut Frame, area: Rect, seconds_until_update: u64) {
+pub fn render_footer(
+    frame: &mut Frame,
+    area: Rect,
+    seconds_until_update: u64
+) {
     let now = Local::now();
     let datatime_str = now.format("%Y-%m-%d %H:%M:%S").to_string();
     let countdown_str = format!("↻ {}s", seconds_until_update);

src/ui/components/monitor_list.rs

@@ -1,10 +1,19 @@
-use std::cmp::min;
+use std::{
-
+    borrow::Cow,
-use crate::i18n::t;
+    cmp::min,
-use crate::ui::dashboard::{
+    collections::{HashMap, hash_map::DefaultHasher},
-    MonitorStatus, MonitorViewState,
+    hash::{Hash, Hasher},
-    model::{DashboardViewState, GroupViewState},
+    sync::{OnceLock, RwLock},
 };
+
+use crate::{
+    i18n::t,
+    ui::dashboard::{
+        MonitorStatus, MonitorViewState,
+        model::{BORDER_LINES_VIEW, DashboardViewState, GroupViewState},
+    },
+};
+use once_cell::sync::Lazy;
 use ratatui::{
     Frame,
     layout::{Alignment, Constraint, Direction, Layout, Rect},
@@ -16,50 +25,72 @@ use ratatui::{
 const STATUS_LINE_LENGTH: usize = 100;
 const MAX_NAME_LENGTH: usize = 30;
 
-pub fn render_monitor_list(frame: &mut Frame, area: Rect, state: &DashboardViewState) {
+static UP_SPAN: Lazy<Span<'static>> =
-    let group_areas = layout_groups(area, &state.groups);
+    Lazy::new(|| Span::styled("■", Style::default().fg(Color::Green)));
 
-    for (i, (group, &group_area)) in state.groups.iter().zip(group_areas.iter()).enumerate() {
+static DOWN_SPAN: Lazy<Span<'static>> =
-        render_group(frame, group_area, group, i == 0);
+    Lazy::new(|| Span::styled("■", Style::default().fg(Color::Red)));
-    }
+
+static UNKNOWN_SPAN: Lazy<Span<'static>> =
+    Lazy::new(|| Span::styled("■", Style::default().fg(Color::Yellow)));
+
+static STATUS_LINE_CACHE: OnceLock<RwLock<HashMap<u64, Line<'static>>>> = OnceLock::new();
+
+pub fn render_monitor_list(main_frame: &mut Frame, area: Rect, state: &mut DashboardViewState) {
+    let available_height = area.height as usize;
+    let max_scroll = state.get_total_length().saturating_sub(available_height);
+
+    if state.scroll_state.get_position() > max_scroll {
+        state.scroll_state = state.scroll_state.position(max_scroll);
     }
 
-fn layout_groups(area: Rect, groups: &[GroupViewState]) -> Vec<Rect> {
+    let scroll_pos = state.scroll_state.get_position();
-    let total_lines: usize = groups.iter().map(|g| g.monitors.len() + 1).sum();
+    let mut current_y = area.y as usize;
+    let mut rendered_height = 0;
+    let mut lines_skipped = 0;
+    let half = state.get_total_length().saturating_div(2);
 
-    if total_lines == 0 {
+    for group in state.groups.iter() {
-        return Vec::new();
+        let group_height = group.monitors.len() + BORDER_LINES_VIEW;
+
+        if lines_skipped + group_height <= scroll_pos {
+            lines_skipped += group_height;
+            continue;
         }
 
-    let content_height = area.height.saturating_sub(2);
+        let visible_height = if lines_skipped < scroll_pos {
-    let line_height = content_height as usize / total_lines;
+            group_height - (scroll_pos - lines_skipped)
+        } else {
+            group_height
+        }
+        .min(available_height - rendered_height);
 
-    let mut current_y = area.y + 1;
+        let group_area = Rect {
-    let mut areas = Vec::with_capacity(groups.len());
-
-    for group in groups {
-        let group_lines = group.monitors.len() + 2;
-        let group_height = (group_lines + line_height).max(1);
-        areas.push(Rect {
             x: area.x,
-            y: current_y,
+            y: current_y as u16,
             width: area.width,
-            height: group_height as u16,
+            height: visible_height as u16,
-        });
+        };
 
-        current_y += group_height as u16;
+        render_group(main_frame, group_area, group, half > rendered_height);
+
+        current_y += visible_height;
+        rendered_height += visible_height;
+        lines_skipped += group_height;
+    }
 }
 
-    areas
+fn render_group(frame: &mut Frame, area: Rect, group: &GroupViewState, is_first_half: bool) {
-}
-
-fn render_group(frame: &mut Frame, area: Rect, group: &GroupViewState, is_first: bool) {
     let chunks = Layout::default()
         .direction(Direction::Vertical)
         .margin(0)
         .constraints([Constraint::Length(1), Constraint::Min(1)])
         .split(area);
 
+    if chunks[0].height == 0 || chunks[1].height == 0 || group.monitors.is_empty() {
+        return;
+    }
+
     let group_title = Line::from(vec![
         Span::styled(format!("{} ", group.name), title_style()),
         Span::styled(
@@ -69,11 +100,7 @@ fn render_group(frame: &mut Frame, area: Rect, group: &GroupViewState, is_first:
     ]);
 
     let title_block = Block::default()
-        .borders(if is_first {
+        .borders(Borders::ALL)
-            Borders::TOP | Borders::LEFT | Borders::RIGHT
-        } else {
-            Borders::ALL
-        })
         .border_style(Style::default().fg(Color::Blue))
         .title(group_title)
         .title_alignment(Alignment::Left);
@@ -81,13 +108,24 @@ fn render_group(frame: &mut Frame, area: Rect, group: &GroupViewState, is_first:
     frame.render_widget(title_block, chunks[0]);
 
     if !group.monitors.is_empty() {
-        render_monitor_table(frame, chunks[1], &group.monitors);
+        render_monitor_table(frame, chunks[1], &group.monitors, is_first_half);
     }
 }
 
-fn render_monitor_table(frame: &mut Frame, area: Rect, monitors: &Vec<MonitorViewState>) {
+fn render_monitor_table(
+    frame: &mut Frame,
+    area: Rect,
+    monitors: &[MonitorViewState],
+    is_first_half: bool,
+) {
     let max_items = area.height as usize;
     let items_to_show = min(monitors.len(), max_items);
+    let index = if is_first_half {
+        monitors.len().saturating_sub(max_items.saturating_sub(2)) // 2 = Table header + botton
+    } else {
+        0
+    };
+    let monitors = &monitors[index..index + items_to_show.min(monitors.len() - index)];
 
     let header_cells = vec![
         "".to_string(),
@@ -99,11 +137,10 @@ fn render_monitor_table(frame: &mut Frame, area: Rect, monitors: &Vec<MonitorVie
 
     let header = Row::new(header_cells).style(title_style()).height(1);
 
-    let rows: Vec<Row> = monitors
+    let mut rows: Vec<Row> = Vec::with_capacity(items_to_show);
-        .iter()
+    for monitor in monitors.iter().take(items_to_show) {
-        .take(items_to_show)
+        rows.push(create_monitor_item(monitor));
-        .map(|monitor| create_monitor_item(monitor))
+    }
-        .collect();
 
     let widths = vec![
         Constraint::Length(3),
@@ -127,14 +164,6 @@ fn render_monitor_table(frame: &mut Frame, area: Rect, monitors: &Vec<MonitorVie
     frame.render_widget(table, area);
 }
 
-pub fn get_status_char(status: &MonitorStatus) -> char {
-    match status {
-        MonitorStatus::Up => '■',
-        MonitorStatus::Down => '■',
-        MonitorStatus::Unknown => '■',
-    }
-}
-
 pub fn get_status_color(status: &MonitorStatus) -> Color {
     match status {
         MonitorStatus::Up => Color::Green,
@@ -143,11 +172,14 @@ pub fn get_status_color(status: &MonitorStatus) -> Color {
     }
 }
 
-pub fn get_status_emoji(status: &MonitorStatus) -> &str {
+pub fn get_status_emoji(status: &MonitorStatus) -> Cow<'static, str> {
+    static UP_ICON: &str = "✅";
+    static DOWN_ICON: &str = "❌";
+    static UNKNOWN_ICON: &str = "❓";
     match status {
-        MonitorStatus::Up => "✅",
+        MonitorStatus::Up => Cow::Borrowed(UP_ICON),
-        MonitorStatus::Down => "❌",
+        MonitorStatus::Down => Cow::Borrowed(DOWN_ICON),
-        MonitorStatus::Unknown => "❓",
+        MonitorStatus::Unknown => Cow::Borrowed(UNKNOWN_ICON),
     }
 }
 
@@ -155,20 +187,24 @@ fn create_monitor_item(monitor: &MonitorViewState) -> Row<'_> {
     let status_icon = get_status_emoji(&monitor.status);
     let status_color = get_status_color(&monitor.status);
 
-    let display_name: String = if monitor.name.len() > MAX_NAME_LENGTH {
+    let display_name: Cow<str> = if monitor.name.len() > MAX_NAME_LENGTH {
-        format!("{:.width$}...", &monitor.name, width = MAX_NAME_LENGTH - 3)
+        Cow::Owned(format!(
+            "{:.width$}...",
+            monitor.name,
+            width = MAX_NAME_LENGTH - 3
+        ))
     } else {
-        monitor.name.clone()
+        Cow::Borrowed(&monitor.name)
     };
 
     let response_text = format!("{:>7}ms", monitor.response_time);
     let uptime_text = format!("{:>7}%", monitor.uptime_24h);
 
-    let status_line_spans = create_status_line_spans(&monitor.status_history);
+    let status_line_spans = get_cached_status_line(&monitor.status_history);
 
     Row::new(vec![
         get_formated_line(format!("{} ", status_icon), status_color, Modifier::empty()),
-        get_formated_line(display_name, Color::White, Modifier::empty()),
+        get_formated_line(display_name.to_string(), Color::White, Modifier::empty()),
         get_formated_line(response_text, Color::Cyan, Modifier::empty()),
         get_formated_line(uptime_text, Color::Magenta, Modifier::empty()),
         status_line_spans,
@@ -184,22 +220,12 @@ fn get_formated_line(text: String, color: Color, modifier: Modifier) -> Line<'st
     )])
 }
 
-fn create_status_line_spans(status_history: &[MonitorStatus]) -> Line<'_> {
+fn get_status_span(status: &MonitorStatus) -> &'static Span<'static> {
-    let recent_status: Vec<_> = status_history
+    match status {
-        .iter()
+        MonitorStatus::Up => &UP_SPAN,
-        .rev()
+        MonitorStatus::Down => &DOWN_SPAN,
-        .take(STATUS_LINE_LENGTH)
+        MonitorStatus::Unknown => &UNKNOWN_SPAN,
-        .collect();
-
-    let mut spans = Vec::with_capacity(recent_status.len());
-
-    for status in recent_status.iter().rev() {
-        let c = get_status_char(status);
-        let color = get_status_color(status);
-
-        spans.push(Span::styled(c.to_string(), Style::default().fg(color)));
     }
-    Line::from(spans)
 }
 
 fn title_style() -> Style {
@@ -207,3 +233,46 @@ fn title_style() -> Style {
         .fg(Color::Yellow)
         .add_modifier(Modifier::BOLD)
 }
+
+fn calculate_history_hash(status_history: &[MonitorStatus]) -> u64 {
+    let mut hasher = DefaultHasher::new();
+    status_history
+        .iter()
+        .take(STATUS_LINE_LENGTH)
+        .for_each(|status| {
+            status.hash(&mut hasher);
+        });
+    hasher.finish()
+}
+
+fn get_cached_status_line(status_history: &[MonitorStatus]) -> Line<'static> {
+    let hash = calculate_history_hash(status_history);
+    let cache = STATUS_LINE_CACHE.get_or_init(|| RwLock::new(HashMap::new()));
+    {
+        let read = cache.read().unwrap();
+        if let Some(line) = read.get(&hash) {
+            return line.clone();
+        }
+    }
+
+    let mut spans: Vec<Span<'static>> = Vec::with_capacity(STATUS_LINE_LENGTH);
+    spans.extend(
+        status_history
+            .iter()
+            .take(STATUS_LINE_LENGTH)
+            .map(|status| get_status_span(status).clone()),
+    );
+
+    let new_line = Line::from(spans);
+    let mut write = cache.write().unwrap();
+    if write.len() > 1000 {
+        let mut keys_to_remove: Vec<u64> = Vec::with_capacity(250);
+        keys_to_remove.extend(write.keys().take(250).copied());
+
+        for key in keys_to_remove {
+            write.remove(&key);
+        }
+    }
+    write.insert(hash, new_line.clone());
+    new_line
+}

src/ui/dashboard/model.rs

@@ -1,9 +1,12 @@
 use crate::core::models::{UnifiedData, UnifiedGroupData};
 use crate::data::heartbeat::model::HeartbeatEntry;
 use crate::i18n::t;
+use ratatui::widgets::ScrollbarState;
 use rayon::prelude::*;
+use std::borrow::Cow;
+pub const BORDER_LINES_VIEW: usize = 3;
 
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum MonitorStatus {
     Up,
     Down,
@@ -12,7 +15,7 @@ pub enum MonitorStatus {
 
 #[derive(Debug, Clone)]
 pub struct MonitorViewState {
-    pub name: String,
+    pub name: Cow<'static, str>,
     pub status: MonitorStatus,
     pub response_time: String,
     pub uptime_24h: String,
@@ -33,6 +36,8 @@ pub struct DashboardViewState {
     pub is_loading: bool,
     pub error_message: Option<String>,
     pub auto_refresh_interval: u32,
+    pub scroll_state: ScrollbarState,
+    total_length: usize,
 }
 
 impl DashboardViewState {
@@ -44,6 +49,8 @@ impl DashboardViewState {
             is_loading: true,
             error_message: None,
             auto_refresh_interval: 300,
+            scroll_state: ScrollbarState::new(0),
+            total_length: 0,
         }
     }
 
@@ -57,32 +64,43 @@ impl DashboardViewState {
             });
         }
 
+        let total_length: usize = groups
+            .iter()
+            .map(|g| g.monitors.len() + BORDER_LINES_VIEW)
+            .sum();
+
         Self {
-            title: data.title,
+            title: data.title.into_owned(),
-            descriptions: data.description,
+            descriptions: data.description.map(|d| d.into_owned()),
             groups,
             is_loading: false,
             error_message: None,
             auto_refresh_interval: data.auto_refresh_interval.max(30),
+            scroll_state: ScrollbarState::new(total_length.saturating_sub(1)),
+            total_length,
         }
     }
 
+    pub fn get_total_length(&self) -> usize {
+        self.total_length
+    }
+
     pub fn get_all_monitors(&self) -> Vec<&MonitorViewState> {
         self.groups.iter().flat_map(|g| g.monitors.iter()).collect()
     }
+
+    pub fn show_vertical_scrollbar(&self, available_height: u16) -> bool {
+        self.total_length as u16 > available_height
+    }
 }
 
 fn get_status_history(heartbeats: &[HeartbeatEntry]) -> Vec<MonitorStatus> {
-    let mut history = heartbeats
+    let mut history: Vec<_> = Vec::with_capacity(heartbeats.len());
-        .iter()
+    history.extend(heartbeats.iter().rev().take(100).map(|h| match h.status {
-        .rev()
-        .take(100)
-        .map(|h| match h.status {
         0 => MonitorStatus::Down,
         1 => MonitorStatus::Up,
         _ => MonitorStatus::Unknown,
-        })
+    }));
-        .collect::<Vec<_>>();
 
     while history.len() < 100 {
         history.push(MonitorStatus::Unknown);
@@ -94,9 +112,11 @@ fn get_status_history(heartbeats: &[HeartbeatEntry]) -> Vec<MonitorStatus> {
 
 fn add_monitor_view_state(group: UnifiedGroupData) -> Vec<MonitorViewState> {
     let mut monitors = Vec::with_capacity(group.monitors.len());
-    group.monitors.into_par_iter().map(|monitor| {
+    group
-
+        .monitors
-        let status_history = get_status_history(&monitor.heartbeats);
+        .into_par_iter()
+        .map(|monitor| {
+            let status_history = get_status_history(monitor.heartbeats);
 
             let status = match monitor.heartbeats.last().map(|h| h.status) {
                 Some(1) => MonitorStatus::Up,
@@ -104,26 +124,30 @@ fn add_monitor_view_state(group: UnifiedGroupData) -> Vec<MonitorViewState> {
                 _ => MonitorStatus::Unknown,
             };
 
-        let response_time = monitor
+            let response_time = match monitor.heartbeats.last().and_then(|h| h.ping) {
-            .heartbeats
+                Some(ms) => format!("{}", ms),
-            .last()
+                None => t("unknown"),
-            .and_then(|h| h.ping)
+            };
-            .map(|ms| format!("{}", ms))
-            .unwrap_or_else(|| t("unknown").to_string() + " ");
 
-        let uptime_24h = monitor
+            let uptime_24h = match monitor.uptime_data.map(|u| u.get_perc_formated()) {
-            .uptime_data
+                Some(perc) => perc,
-            .map(|u| u.get_perc_formated())
+                None => t("unknown"),
-            .unwrap_or_else(|| t("unknown").to_string());
+            };
+
+            let name: Cow<'static, str> = match monitor.name {
+                Cow::Borrowed(borrowed) => Cow::Owned(borrowed.to_string()),
+                Cow::Owned(owned) => Cow::Owned(owned),
+            };
 
             MonitorViewState {
-            name: monitor.name,
+                name,
                 status,
                 response_time,
                 uptime_24h,
                 status_history,
             }
-    }).collect_into_vec(&mut monitors);
+        })
+        .collect_into_vec(&mut monitors);
 
     monitors.sort_by_key(|m| m.name.clone());