The React Compiler Just Made useMemo Obsolete

I spent last week removing 142 useMemo calls from our production codebase. Not because they were wrong. Because the React Compiler made them unnecessary. The v1 release dropped quietly. No fanfare. But if you're still writing useMemo and useCallback everywhere, you're doing work the compiler now handles automatically. What actually changed The compiler tracks dependencies across components. Not just within a single hook, but across the entire render tree. It knows when a value is stable and when it's not. It inserts memoization boundaries where they matter and skips them where they don't. Three things it does better than you: → Cross-component dependency tracking. Your useMemo only sees what's inside its own scope. The compiler sees the full picture, including dynamic hooks. → Automatic bailouts for unstable references. You know that bug where your useEffect fires every render because an object reference changes? The compiler catches that. → Tree-aware memoization boundaries. Instead o