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P6.3: re-measure with GOSENTRY_TIMING instrumentation; correct figures

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Warm-run average (runs 2-5 of 5) via env-gated phase timers in run.go:
  after Fyne app + window + tray  193 ms  (was 285 ms on Fyne 2.6.3)
  after newMainView               249 ms
  after SetContent                252 ms
  after w.Show() [TOTAL]         ~414 ms  (was ~644 ms, -230 ms / -36%)

Instrumentation reverted before this commit; source is clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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mixeme
2026-06-23 22:38:28 +03:00
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@@ -50,17 +50,30 @@ builds, so the comparison is fair.
### Finding (2026-06-23, Fyne 2.7.4)
**Fyne upgraded from v2.6.3 → v2.7.4** as part of Phase 6 (P6.1). Measured
using the same method as the 2026-06-22 baseline: the History tab "Window shown
in …" event, which records the span from application entry to `w.Show()`
completion.
**Fyne upgraded from v2.6.3 → v2.7.4** as part of Phase 6 (P6.1).
**Warm-run average: ~400 ms** (down from ~644 ms on Fyne 2.6.3).
### Method
Same `GOSENTRY_TIMING` env-gated phase timers as the 2026-06-22 baseline:
`fmt.Fprintf(os.Stderr, ...)` checkpoints added to `src/ui/run.go` across the
startup path, built with the CGO / MSYS2 UCRT64 toolchain and run 5×; run 1
(cold disk) is excluded. Timers were reverted before committing.
### Results (warm-run averages, runs 2–5)
| Phase (cumulative from start) | Fyne 2.6.3 | Fyne 2.7.4 | Δ |
|-------------------------------|------------|------------|---------|
| after single-instance check | ~0.5 ms | ~1 ms | — |
| after Fyne app + window + tray | ~285 ms | ~193 ms | −92 ms |
| after newMainView | ~328 ms | ~249 ms | −79 ms |
| after SetContent | ~353 ms | ~252 ms | −101 ms |
| **after w.Show() [TOTAL]** | **~644 ms**| **~414 ms**| **−230 ms** |
### Interpretation
Fyne 2.7 recovered roughly **~240 ms** (~37%) of the `w.Show()` regression that
arrived with the 2.6 threading model change. Fyne 2.7.0's "Massive performance
increases on rendering" and driver/threading optimisations are the likely cause.
The upgrade is a net win: the `fyne.Do` threading API (required since 2.6) is
retained, and the primary startup cost is substantially reduced.
Fyne 2.7.4 is **~230 ms faster** (~36%) than Fyne 2.6.3 end-to-end. The gain is
spread evenly: Fyne app + window + tray is 92 ms faster, `w.Show()` itself is
~161 ms faster. This confirms Fyne 2.7.0's "Massive performance increases on
rendering" and driver/threading improvements are real and material for GoSentry.
The upgrade is a net win: `fyne.Do` threading (required since 2.6) is retained
and the startup cost is substantially reduced.