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4grayandClaude Opus 5.5
37ee8813a7
Re-lands #1788, which merged into #1782's branch after #1782 had already reached master, so none of it is on master. The hidden main window was shown on ready-to-show only. On Linux under X11, when the startup scripts run before the window's first frame, the next frame comes about a second later: nothing is on screen and the splash's requestAnimationFrame waits, so J1's first card came ~940 ms after load instead of ~480 ms in most runner launches (18 bridge calls / 1,031-1,033 DOM mutations instead of 15 / 558). The window is now shown at ready-to-show or the main frame's did-finish-load, whichever comes first, with the splash colour as its background so showing before the first paint does not flash. The journey gate keeps the app's did-finish-load listeners away from its about:blank detour, as it already does for ready-to-show. Three dispatched runs on this branch (37192092882, 37192097790, 37192103151) read 15 calls and 558 mutations in all 18 iterations, stable: true. Both become baselines (slack 0), and the Performance journeys job checks them with check-journey-ratchet.mjs --only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>