React Compiler @ Meta
summary
React Compiler rolls out as the default on Quest Store and Instagram and automatically inserts memoization at scale, adding over 15x the memo calls found in source. For some click and scroll interactions pages become >2x faster, initial load and cross‑page navigation improve up to 12%, Quest loads and navigations gain ≥4% and Instagram averages +3% per route. No measurable increase in memory use or crashes, and teams can remove manual useMemo/useCallback without losing those gains.
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