Which framework delivers better startup time and UI smoothness in 2025—Flutter or React Native?

Compares cold/warm startup speeds, frame-rate stability, and memory usage on budget devices using mid 2025 benchmarks.

• Flutter achieves faster performance: cold start ~1.2 s, warm start ~85 ms, consistently hitting 60–120 fps in animations thanks to the Impeller engine and AOT compilation. Its idle memory use (~148 MB) is lower and smoother under load. • React Native, with its new Bridgeless / Fabric architecture, improves startup (~1.4–1.6 s) and average UI performance (~52 fps scroll), but still shows occasional jank and higher memory consumption (~162 MB). Flutter remains faster and more resource-efficient. Tags: flutter, react-native, performance, startup-time, ui, memory