Which framework—Flutter or React Native—offers better cold/warm startup performance and smoother UI in 2025?

Compares startup times, animation fluidity, memory usage, and UI frame consistency between Flutter and React Native.

• Flutter delivers better performance: cold start ≈ 1.2 seconds, warm start ≈ 85 ms; maintains stable 60–120 fps for animations, and lower memory (~148 MB) thanks to the Impeller engine and AOT compilation. • React Native, despite improvements via Fabric and Hermes, has slower cold starts (~1.4–1.6 s) and averages ~50–55 fps under heavy UI load; memory usage is higher (~162 MB). Tags: flutter, react-native, performance, startup-time, ui, memory