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animation-jank-qa

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Diagnose a concrete rendered hitch or stutter.

skills/animation-jank-qa/SKILL.md

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Last checked
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Oct 22, 2026
License
MIT

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# Animation Jank QA

Use this skill for symptom-led runtime diagnosis. Start from a reproducible jank case and determine whether it comes from main-thread work, layout/paint, asset pressure, scroll coupling, competing animation systems, or lifecycle cleanup.

## Workflow

1. Reproduce the exact affected route, interaction, viewport, and device class.
2. Read [Animation Jank QA Guide](references/animation-jank-qa-guide.md) for relevant diagnosis and retesting steps.
3. Run the narrowest meaningful trace or rendered check for the symptom; inspect frame timing, long tasks, forced layout, paint/compositing, asset decode, observers, timers, and RAF loops as applicable.
4. Fix issues when they are in scope; otherwise record exact evidence and remaining risk.
5. Retest the original symptom and summarize commands, URLs, traces/screenshots, changed files, and what was not tested.

## Always Protect
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