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docs: record startup-time research; plan re-check after Fyne 2.7.x

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Add docs/PERFORMANCE.md documenting the post-Phase-4 startup slowdown:
the ~290ms increase is entirely Fyne 2.5.3->2.6.3's w.Show() cost, not
the Service/domain/UI refactor. Includes the GOSENTRY_TIMING method and
warm-run results table so it can be reproduced.

Wire the startup re-measurement into the existing Fyne 2.6.3->2.7.x
upgrade task in ROADMAP.md so 2.7's effect on w.Show() gets checked.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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mixeme
2026-06-22 00:31:31 +03:00
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@@ -35,6 +35,10 @@ window.
- The project is currently on Fyne 2.6.3, so this depends on a Fyne 2.6.3 -> 2.7.x
upgrade first (minor bump; re-verify the CGO build under MSYS2 UCRT64 and check
for 2.7 breaking changes). Track the upgrade as its own task.
- As part of that upgrade, **re-measure startup time** with the `GOSENTRY_TIMING`
method recorded in [PERFORMANCE.md](PERFORMANCE.md). The Fyne 2.5.3 -> 2.6.3 bump
added ~290 ms to startup, all inside `w.Show()`; check whether 2.7 recovers any
of it or holds steady, and append the result to PERFORMANCE.md.
- After upgrading, the change in `src/ui/run.go` (configureSystemTray) is small:
call `desk.SetSystemTrayWindow(w)` alongside `SetSystemTrayMenu(menu)`. Keep the
existing "Show" menu item, which the Fyne docs recommend for less-compliant