The process-wide disable-background-timer-throttling /
disable-backgrounding-occluded-windows switches plus a static
backgroundThrottling: false on every chat window pinned each renderer's
document.visibilityState to 'visible' for the life of the window. Every
visibility-gated backstop poll and clock tick in the renderer became an
always-on timer: an idle, minimized Hermes burned ~20% CPU around the
clock, on battery too.
Throttling is now a runtime dial. A small controller (stream-throttle.ts)
rides the merged hermes:active-work reports the quit guard already
receives: while any turn is in flight every chat window gets
setBackgroundThrottling(false) — a live answer keeps painting while
blurred, occluded, or minimized, exactly as before — and once all turns
settle (plus a 5s trailing window so the final flush lands at full
cadence) Chromium's default throttling returns and hidden windows go
quiet.
disable-renderer-backgrounding stays: process priority only, no timer
semantics, and it keeps hidden streaming fast.
Brooklyn Nicholson