Posts tagged UX engineering.

I memoized the context value and wrapped the hot components in React.memo, standard advice, and one click still re-rendered a list 221 times. Context notifies every consumer when the value object's identity changes, regardless of which field a consumer reads, and no memo can stop that. The fix: a selector-based Zustand store.

Every AI agent UI is secretly two UIs: one renders events live over SSE, the other rebuilds the same timeline from the database on reload. They have to match exactly, and five separate bugs, from parsing to null handling to ordering, proved they easily don't.