𝟱 𝗥𝗲𝗮𝗰𝘁 𝗝𝗦 𝗧𝗿𝗶𝗰𝗸𝘀 𝗳𝗼𝗿 𝗕𝗲𝘁𝘁𝗲𝗿 𝗦𝗽𝗲𝗲𝗱 𝗶𝗻 𝟮𝟬𝟮𝟲

𝟱 𝗥𝗲𝗮𝗰𝘁 𝗝𝗦 𝗧𝗿𝗶𝗰𝗸𝘀 𝗳𝗼𝗿 𝗕𝗲𝘁𝘁𝗲𝗿 𝗦𝗽𝗲𝗲𝗱 𝗶𝗻 𝟮𝟬𝟮𝟲

Slow apps hurt business. Users leave after two seconds. SEO rankings drop. You need a lean app.

Here are five ways to fix it.

• Smart Memoization Stop using useMemo and useCallback for every small task. Use them for heavy math. Use them when prop stability matters. Measure with DevTools Profiler before you change code.

• Code Splitting Do not ship your whole app in one bundle. Use React.lazy and Suspense. Split code by route. Lazy load heavy components like maps or editors.

• List Virtualization Large lists kill speed. Rendering thousands of nodes slows the browser. Use @tanstack/react-virtual. It renders visible items only. Use this for any list over 100 items.

• State Collocation Global state causes too many re-renders. Move state close to where you use it. Split contexts by domain. Use Zustand or Jotai for shared state.

• Concurrent Features Use useTransition and useDeferredValue. These stop the UI from freezing. Use them for search bars and tab switches. They keep the app responsive.

Simple workflow. Measure. Identify the bottleneck. Fix it. Measure again.

Source: https://dev.to/aamir_dev/5-react-js-tricks-to-improve-site-speed-and-efficiency-in-2026-4ck3