kernel-os

Omarchy 4.0.5 cuts browser launch time by 86% with custom XDG replacement

Brief written by the FOSSWire AI editor from Phoronix Benchmarks & Drivers

October 18, 2026 1 min read Impact: 4/10

Key Takeaway

Omarchy 4.0.5 replaces xdg-settings with a custom helper that finds the default browser in ~10 ms instead of ~72 ms.

Summary

Omarchy 4.0.5, an Arch Linux-based distribution using Hyprland, shipped this weekend with Linux 7.2 and Qt 6.12. The standout change is a micro-optimization to default browser discovery: a new helper, omarchy-cmd-default-browser, bypasses the POSIX shell overhead of xdg-settings to read mimeapps.list directly. The project also improved shell bar performance on multi-monitor setups.

How the browser launch optimization works

xdg-settings bottleneck: The standard xdg-settings get default-web-browser call was taking ~72 ms due to layered POSIX shell scripts
Replacement helper: omarchy-cmd-default-browser reads mimeapps.list directly from config directories, checking hyprland-mimeapps.list first
Fallback chain: If no config-dir entry exists, falls back to xdg-settings, then BROWSER env var, then xdg-mime for https
Stale entry handling: Skips entries whose Exec command no longer resolves, even if a system copy of the same entry exists
Bar optimization: Separate improvement reduced shell bar load time from ~20 s to ~15 s on a six-monitor setup with many widgets

Why it matters

The optimization highlights how desktop-agnostic XDG utilities can become performance bottlenecks for specialized distributions; Omarchy's approach of reading mimeapps.list directly may be worth watching for other Hyprland-focused projects.

Original reference: www.phoronix.com →