Which framework delivers better cold/warm startup speed and smoother UI animations in 2025—Flutter or React Native?

Compares cold and warm app startup times, animation frame rates, and memory profiles on real-world devices.

• Flutter consistently outperforms: cold start ~1.2s, warm start ~85 ms; delivers stable 60–120 fps, and uses lower memory (~148 MB) thanks to its Impeller engine and AOT compilation. • React Native (with Fabric, Hermes, and Bridgeless architecture) still lags: cold start ~1.4–1.6s, smoothness drops to ~45–52 fps under heavy UI, memory use is around ~162 MB. Tags: flutter, react-native, performance, startup-time, ui, memory