Which framework offers faster cold/warm start and smoother UI in 2025—Flutter or React Native?

Compares startup times, frame rate consistency, and memory usage between Flutter and React Native based on 2025 benchmarks.

• Flutter performs best: cold start ≈ 1.2 s, warm start ≈ 85 ms, consistent 60fps animation—even under load—with lower memory usage thanks to Impeller engine and AOT compilation. • React Native, using Fabric, JSI, and Hermes, improves performance, but cold start ≈ 1.6 s and UI under heavy load may still drop frames. Flutter leads on resource efficiency and smoothness, especially on budget devices. Tags: flutter, react-native, performance, startup-time, ui, memory