LotusGuild/cinny

perf(backgrounds): animated chat backgrounds cost ~5% CPU instead of 50 to 70% (#337) #361

Merged

jared merged 2 commits from fix/animated-bg-compositor into lotus

2026-10-16 20:52:35 -04:00

Author	SHA1	Message	Date
jared	d55a8ba8a5	Merge branch 'lotus' into fix/animated-bg-compositor CI / Build & Quality Checks (pull_request) Successful in 1m52s Details CI / Trigger Desktop Build (pull_request) Skipped Details CI / Docker image build & smoke test (pull_request) Skipped Details CI / Secret scan (gitleaks) (pull_request) Successful in 9s Details CI / Playwright smoke (e2e) (pull_request) Successful in 11m11s Details	2026-10-16 19:59:31 -04:00
Lotus CIandClaude Opus 5.5	2700aad209	perf(backgrounds): animated chat backgrounds cost ~5% CPU instead of 50 to 70% (#337 ) CI / Build & Quality Checks (pull_request) Successful in 1m57s Details CI / Trigger Desktop Build (pull_request) Skipped Details CI / Docker image build & smoke test (pull_request) Skipped Details CI / Secret scan (gitleaks) (pull_request) Successful in 9s Details CI / Playwright smoke (e2e) (pull_request) Failing after 9m56s Details background-position can't run on the compositor, so every frame of the animated chat backgrounds repainted the whole chat area: 51 to 72% main-thread busy while idle in a room at 60 fps. The drifts are slow (3 to 22 px/s, under a pixel per frame), so each animation now uses steps(): about 12 updates/s for fireflies, stars and aurora and about 24/s for rain and pulse. Measured headless (20 s idle in a room, CDP TaskDuration): none 0.7% → 0.9%; rain 50.7 → 5.9; stars 71.2 → 4.5; pulse 64.9 → 5.8; aurora 58.9 → 4.2; fireflies 71.7 → 3.8. Aurora and pulse used ease-in-out; with steps() their motion is now even-paced. Pause animations / reduced motion still strip the animation. Fixes #337 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5	2026-10-16 19:05:52 -04:00