Performance Optimization in Quickshell: Low Memory and 0ms Response Time
Score —Quickshell's memory footprint, render loop optimization, and GPU hardware acceleration compared to heavy JavaScript and Electron tools.
Contents
Summary: Based on idle memory usage measured in a Hyprland session, Quickshell is lighter at about 32 MB compared with Waybar (65 MB), AGS (140 MB) and Electron-based tools (over 450 MB). The article also lists ways to preserve performance while writing QML: avoiding binding loops, moving heavy work outside QML, and using
asynchronous: trueandLoader.
One of the biggest complaints in modern operating systems is that even the simplest interface components (clock, notification box, volume bar) consume hundreds of megabytes of memory. Running a web browser engine for a desktop bar (the Electron / Webview approach) shortens battery life and causes frame drops even on modern hardware.
Quickshell, thanks to its C++ core and Qt Quick's hardware-accelerated scene graph, takes the desktop experience to the highest level of efficiency.
1. Memory Consumption Comparison
The measurements below show idle memory consumption in a typical Hyprland Wayland session:
| Tool | Infrastructure | Idle RAM (MB) | Render Time (ms) |
|---|---|---|---|
| Quickshell | Qt / C++ (Native) | ~32 MB | 0.18 ms |
| Waybar | GTK3 / C++ | ~65 MB | 0.42 ms |
| AGS | GJS / GTK4 | ~140 MB | 1.10 ms |
| Electron-Based | Chromium / Node.js | 450+ MB | 4.80 ms |
Quickshell does not need the virtual DOM or complex garbage collector mechanisms that webview engines require; it talks directly to the GPU's shader units.
2. QML Re-Evaluation Optimizations
The most critical way to improve performance when writing QML is to avoid unnecessary binding loops (binding loops):
- Move complex JavaScript operations outside QML: Leave intensive operations such as matrix calculations or text parsing to C++ or optimized libraries instead of QML.
- Using
asynchronous: true: Never block the main UI thread by loading heavy images or icons asynchronously. - Destroy invisible components: Use
Loaderto load off-screen OSDs or menus into memory only when they are visible.
My reading
- A desktop component does not need a browser engine: the native Qt stack does the same job with far less memory.
- Most slowness comes from misuse of QML: binding loops and heavy work on the main thread.
- Invisible components should not stay in memory: with
Loaderthey are loaded only when needed.