Glossary term
What is startTransition? Meaning for developers
Marks a React state update as not urgent. React can render it in the background, and urgent input can interrupt it.
Learn it properly · Scenario DebuggingLesson 1: “The API Is Fast but the UI Is Slow”: How to Solve ItThe network tab says 80 ms, but users wait two seconds. Long main-thread tasks, huge JSON, many re-renders, layout thrashing and hydration cost, all linked to INP.