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Krzysztof kuhy Rudnicki 7a7a7e7e99 Document why the Linux desktop build must move off Flutter's embedder 
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>
2026-07-20 12:48:38 +02:00
.agents/skills Add Flutter/Dart agent skills and AI rules for Claude Code 2026-06-22 22:53:03 +02:00
android Replace the stock Flutter launcher icon, add a Linux desktop icon 2026-07-19 17:01:32 +02:00
assets/icon Replace the stock Flutter launcher icon, add a Linux desktop icon 2026-07-19 17:01:32 +02:00
docs Document why the Linux desktop build must move off Flutter's embedder 2026-07-20 12:48:38 +02:00
lib Switch to very_good_analysis, matching the rest of the Flutter ecosystem 2026-07-20 11:05:13 +02:00
linux Replace the stock Flutter launcher icon, add a Linux desktop icon 2026-07-19 17:01:32 +02:00
mcp Add read-only MCP server for the backlog 2026-07-10 21:20:39 +02:00
test Surface sync outcomes so devices can't silently diverge 2026-07-16 17:58:41 +02:00
tool Switch to very_good_analysis, matching the rest of the Flutter ecosystem 2026-07-20 11:05:13 +02:00
.gitignore Add list filters/sort, status, priority rework, export/import, structured template 2026-06-15 16:52:59 +02:00
.mcp.json Add read-only MCP server for the backlog 2026-07-10 21:20:39 +02:00
.metadata Initial commit: offline-first CRDT notes app (capture + GitHub sync) 2026-06-14 14:20:19 +02:00
analysis_options.yaml Switch to very_good_analysis, matching the rest of the Flutter ecosystem 2026-07-20 11:05:13 +02:00
CLAUDE.md Point notes sync at the consolidated syncs monorepo 2026-07-10 14:04:05 +02:00
install_arch.sh Silence noisy gdb-add-index warnings in install_arch.sh 2026-07-19 14:43:44 +02:00
LICENSE Add MIT license 2026-06-14 14:42:45 +02:00
MIGRATION.md Add MIGRATION.md documenting the sqlite_crdt -> crdt_sync move 2026-07-11 23:55:08 +02:00
pubspec.lock Switch to very_good_analysis, matching the rest of the Flutter ecosystem 2026-07-20 11:05:13 +02:00
pubspec.yaml Switch to very_good_analysis, matching the rest of the Flutter ecosystem 2026-07-20 11:05:13 +02:00
README.md Initial commit: offline-first CRDT notes app (capture + GitHub sync) 2026-06-14 14:20:19 +02:00
run.sh Add run.sh to install Flutter desktop deps and launch the app 2026-06-19 17:05:45 +02:00
skills-lock.json Add Flutter/Dart agent skills and AI rules for Claude Code 2026-06-22 22:53:03 +02:00

README.md

todo

A new Flutter project.

Getting Started

This project is a starting point for a Flutter application.

A few resources to get you started if this is your first Flutter project:

For help getting started with Flutter development, view the online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.