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Krzysztof kuhy Rudnicki
7a7a7e7e99
The desktop app is unusably slow at 4K while the phone is fine. Measured it rather than guessing, and the cause is not what the previous session assumed. Flutter's Linux embedder has two independent defects, neither fixable in app code: - It schedules frames at a fixed 60 FPS regardless of the monitor (flutter/flutter#183703, P2, no PR). - Far worse, at 3840x2160 it achieves 18.6 fps while each frame costs only ~3ms of a 16.7ms budget -- ~50ms per frame is dead time in the presentation path. This is the lag actually being reported. The stock `flutter create` counter app collapses identically (20.5 fps vs todo's 20.6 at 4K), and todo's own build time is 0.1-0.4ms everywhere, so no application-level change can help. Impeller does not help either: it changes rasterisation, not presentation. The same Dart code as a web build hits 142.9 fps at the same 4K size on the same machine -- a 7x difference -- so the fix is to drop the Linux desktop embedder, not Flutter or Dart. Also records the agreed migration plan and the Xephyr -glamor test harness, including the two measurement mistakes made along the way (synthetic xdotool input never reached the app; software Xephyr dominated an early 4K run) so the numbers here can be trusted and reproduced. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| initial_design.md | ||