The screen repaints once a second to keep its rates, ages and clock
honest. Both of its expensive stages are pure functions of data that
mostly does not move between those frames: the window digest re-walked up
to four thousand observations to reach the numbers it already had, and
the braille activity chart re-rasterized an identical picture.
The window changes in exactly two places — an arriving observation, an
expiring one — so both bump a revision the digest compares against. The
chart memoizes on the numbers it draws from. An idle repaint: 8.4 -> 3.8 ms.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 5
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