Two places said the history cushion's evidence was a swipe that moved
nothing for 689ms. That reading came from `ui-trace show` on a row taller
than the viewport, which reports clipped bounds and so prints "nothing
moved" for a list that is scrolling fine -- and it was taken on the software
renderer besides. The finding it supported is sound and has a better
witness: counted at the server, ten swipes asked for ten pages before the
change and three after, which does not depend on how anything renders.
Also records what the screen actually costs now, measured on the GPU
emulator: 5.2-5.9% janky frames and 0-2 slow UI-thread frames flinging fast,
against 3.3% for the stock Settings app on the same device. With the note
that matters for repeating it -- let the screen settle before resetting
gfxinfo, because the first seconds after opening a session are every row
being composed for the first time and read three times worse.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
irisandClaude Opus 5
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