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e50f620aa371f4d594481fa243097656a91a654a
gig-line/Docs/perf/0.2.0-walk-frametimes-overlay.csv
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zwitschi bc2e9c3b8e feat(hud): F3 debug overlay — FPS, frame time, worst frame, state 
A top-left readout for performance work: smoothed FPS and frame time, the worst
frame in a rolling two-second window, the active view, player speed, a frame
counter and the player's position in metres from the project origin.

- F3 toggles it, through the console variable gigline.Debug so a packaged build can
  be checked without a rebuild (IA_ToggleDebug).
- On automatically for -perf and -qaselftest, so a performance capture never depends
  on pressing a key first; off in the built demo, because a player should not see an
  FPS counter over Hollywood Boulevard.
- The first two seconds are a warm-up window excluded from the worst-frame figure.
  Without it the readout showed "worst 400 ms" for a healthy run: the startup shader
  and streaming hitches dominated the rolling maximum.

Measured cost on the self-test route at 1440p: 2.64 to 2.77 ms average, about 5 %,
still 6x the floor. The release-check number stays the overlay-off run; the
overlay-on series is committed beside it as
Docs/perf/0.2.0-walk-frametimes-overlay.csv.

Docs: controls (F3 row, overlay section, switch table), release checks (cost row),
architecture building block view (HUD and input list).
2026-11-09 12:41:01 +01:00

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