Every D-pad step on the TV home ends with a spotlight swap, and on a
low-end box that frame ran over budget: 12 % of UI-thread CPU during
navigation was paragraph layout, most of it shaping strings a second time
to measure them before the render tree shaped them for real.
- FittingTitleText no longer lays the title out to learn whether it fits:
Text wraps and ellipsizes at maxLines, so the box can only overflow
vertically, and one cached one-glyph line height settles that. Only a
box shorter than maxLines lines still searches, now bracketed by the
proportional shrink of the base layout and stopped at a 0.25 px
tolerance instead of a fixed 12 bisections.
- FittedMetadataLine and inlineRatingBadgeWidth measure through a small
bounded cache keyed by text, style, scaler and direction, so separators,
type labels, certifications, runtimes and years measure once per
session.
- MediaHub.isContinueWatchingHub/usesContinueWatchingAction memoize their
regex tokenisation per key; every card build and step re-asked them.
Cold navigation on the Android 14 box (30 steps over three hubs): build
312-316 ms -> 284-285 ms, layout 530-540 ms -> 515 ms, UI frame p90
7.5-7.9 ms -> 6.8-7.2 ms.
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