Concurrent Rendering in React 18
A deep dive into concurrent rendering in React 18. Learn what 'interruptible rendering' actually means at the scheduler level, how React breaks work into 5ms slices using shouldYield, how priority lanes like SyncLane, DefaultLane, and TransitionLane decide what renders first, and how startTransition and useTransition opt updates into low-priority work that can be paused, thrown away, and restarted. We also cover why React's all-or-nothing commit guarantees UI consistency even when work-in-progress trees are abandoned mid-render.
0:00 Intro
0:28 The Setup
1:27 Sync Rendering
2:27 Interruptible Renders
4:12 UI Consistency