This is the part most React Native content skips, and it is the part that actually determines whether an app scales gracefully or falls apart under real usage.

Turn on the New Architecture

React Native's New Architecture, built on Fabric, TurboModules, and JSI, has been the default since version 0.76, released in September 2025. It replaced the old asynchronous bridge with a more direct communication layer between JavaScript and native code, which resolves a large share of the performance complaints that used to follow the framework around. If a codebase predates that release and has not been migrated, upgrading is the single highest-leverage performance change available before touching anything else.

Render lists with FlatList, not ScrollView

Rendering a long list inside a plain ScrollView means every item mounts at once, whether it is visible or not. FlatList and SectionList render only what is on screen and recycle views as the user scrolls, which is the difference between a smooth feed and one that chokes past a few hundred items.

Optimize images and assets before they ship

Oversized images are one of the most common, most avoidable performance drains in a React Native app. Resizing images to the dimensions they are actually displayed at, serving the right format, and lazy-loading anything off-screen keeps memory usage down and initial load times fast, especially on mid-range Android devices that make up a large share of any app's real-world install base.

Move animations off the JS thread

Animations driven entirely by JavaScript compete with everything else running on that thread, which is how a busy screen ends up dropping frames during a transition. Libraries like Reanimated run animation logic on the UI thread directly, keeping motion smooth even when the JS thread is doing other work.

Memoize deliberately, not everywhere

React.memo, useCallback, and useMemo prevent unnecessary re-renders, but wrapping every component and function in them by default adds overhead without a clear payoff. Profile first with the React DevTools profiler to find where re-renders are actually a problem, then apply memoization there specifically.

Keep state close to where it is used

Not every piece of state belongs in a global store. Local component state handles most UI-level needs, and reserving Redux, Zustand, or Context for genuinely shared, cross-screen data keeps re-renders scoped to the components that actually need to react to a change.

Reduce bundle size and lean on Hermes

A smaller JavaScript bundle means a faster app start, especially on lower-end Android devices where cold start time is felt the most. Code splitting, removing unused dependencies, and running on the Hermes engine, which compiles JavaScript to bytecode ahead of time rather than parsing it at runtime, all shrink that startup gap. Hermes has shipped as React Native's default engine for a while now, but older codebases that were never fully migrated are leaving a real performance gain on the table.

Batch and cache network requests

A screen that fires ten separate API calls on mount, each blocking part of the UI until it resolves, feels slow even on a fast connection. Batching related requests, caching responses that do not need to be fetched fresh every time, and showing skeleton states while data loads keeps the interface feeling responsive instead of frozen. Libraries like React Query or SWR handle most of this caching logic out of the box, which is usually a better starting point than hand-rolling it.