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Bitlyst

Short, diagram-first posts on JavaScript, React & Next.js. Follow via RSS or the newsletter.

© 2026 Mohsen Fallahnejad

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3 posts

useDeferredValue Explained: Keeping React UIs Responsive

How useDeferredValue works under the hood, when to use it, and how it differs from useTransition.

Dec 12, 20251 min read

useTransition Explained: Make React Feel Instant

How useTransition works under the hood, when to use it, and how it differs from useDeferredValue.

Dec 12, 20253 min read

React Fiber Explained: How React’s Engine Actually Works

A deep but clear explanation of React Fiber — the engine that powers modern React rendering and concurrency.

Oct 8, 20254 min read5

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#react#hooks#performance#fiber#react internals#reconciliation#ux