perf: eliminate idle CPU waste (socket events + adaptive FPS) - #580
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Core447 merged 2 commits intoJun 10, 2026
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…hanges Replace the 200ms polling loop that spawns 'hyprctl activewindow -j' (via flatpak-spawn + xdg-dbus-proxy when running in Flatpak) with a direct connection to Hyprland's socket2 IPC event stream. The old approach spawns ~5 processes/second even when no window changes occur, causing 10-30% CPU usage on the flatpak-session-helper and xdg-dbus-proxy (see StreamController#433 and StreamController#457). The new approach uses a blocking Unix socket read with zero CPU when idle. Changes: - Listen for 'activewindow>>' events on Hyprland's .socket2.sock - Auto-detect socket path via HYPRLAND_INSTANCE_SIGNATURE env var - Fallback to legacy polling if socket is unavailable - Add --filesystem=xdg-run/hypr:ro to Flatpak manifest for socket access - Reconnect automatically if the socket is closed (e.g. compositor restart) Fixes StreamController#433 (partially — eliminates the subprocess-spawning component) Fixes StreamController#457 (eliminates the flatpak-spawn/xdg-dbus-proxy tight loop)
The MediaPlayerThread runs at 30 FPS unconditionally, iterating over all keys/dials every ~33ms even when there is no video background, no key videos, and no scrolling labels. On a 15-key Stream Deck MK.2, this burns ~20% CPU in pure Python overhead for no visible benefit. Add dynamic FPS: detect whether any animated content (video, scroll labels) or pending image tasks exist. When idle, throttle to 2 FPS (500ms sleep). Immediately return to 30 FPS when animation starts or tasks are queued. This preserves full responsiveness for video/animation while reducing idle CPU from ~20% to ~1%.
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Thank you! Only merged the hyprland changes because #579 already did the same 2 fps strategy |
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Problem
StreamController idles at 20-30% CPU on Hyprland systems, caused by two independent tight loops:
1. Window grabber polling (Hyprland)
The Hyprland integration polls hyprctl activewindow -j every 200ms. Inside Flatpak, each poll spawns flatpak-spawn → hyprctl, causing sustained CPU on flatpak-session-helper and xdg-dbus-proxy.
2. Media player thread at 30 FPS unconditionally
MediaPlayerThread runs at 30 FPS even when there is no video background, no key videos, and no scrolling labels. On a 15-key Stream Deck, this iterates all keys 30x/sec in pure Python for zero visual benefit.
Solution
Commit 1: Hyprland IPC socket events
Replace polling with a direct connection to Hyprland's socket2 IPC event stream. Listen for activewindow>> events with a blocking socket read — zero CPU when idle.
Commit 2: Adaptive media player FPS
Detect whether any animated content exists (video, scroll labels, pending image tasks). When idle, throttle from 30 FPS to 2 FPS. Return to 30 FPS instantly when animation starts.
Results (measured on Stream Deck MK.2, Hyprland, Flatpak)
Fixes #433
Fixes #457