fixing-motion-performance

Audit and fix animation performance issues including layout thrashing, compositor properties, and scroll-linked motion. Fix animation performance issues. /fixing-motion-performance Apply these constraints to any UI animation work in this conversation. /fixing-motion-performance Review the file against all rules below and report: Do not migrate animation libraries unless explicitly requested. Apply rules within the existing stack. Reference these guidelines when: - Covers nine rule categories by priority: never patterns, mechanism selection, measurement batching, scroll-linked motion, paint optimization, layer promotion, blur/filter constraints, view transitions, and tool boundaries - Provides file-level review mode that identifies violations with exact line quotes, impact explanation, and concrete code fixes - Includes FLIP-style transition patterns, scroll timeline alternatives to JS polling, and guidance on batching DOM reads before writes - Applies constraints within existing animation stacks without forcing library migrations - /fixing-motion-performance Apply these constraints to any UI animation work in this conversation. - /fixing-motion-performance Review the file against all rules below and report: - violations (quote the exact line or snippet) - why it matters (one short sentence) - a concrete fix (code-level suggestion) - adding or changing UI animations (CSS,...