perf(site): reduce spinner rendering frequency - #28182
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A continuously animated spinner keeps Chrome rendering at display refresh rate even when the Agents page has no JavaScript activity. Override indefinite
animate-spinanimations to use 12 discrete updates per second, and respect reduced-motion preferences for the persistent sidebar status.An isolated spinner dropped from 59.4 to 12.1 rendered frames per second and from 4.6% to 1.9% of one Chrome core. In an active-chat fixture with five concurrent tool spinners, stepping reduced Chrome CPU from about 26.0% to 20.7%; pausing those spinners measured 19.2%, confirming they accounted for about 6.8 percentage points while the remaining active-chat work continued at 60 Hz.
Implementation and validation notes
spinanimation withsteps(12, end)while preserving the smooth one-shotspin-onceanimation.MCP Tool Completed; the three affected running-spinner stories pass when selected directly.This pull request was generated by Coder Agents.