Benchmarking Expo Router Navigation: Memory Footprint and Frame Drop Analysis Under Deep Stack Depth

When migrating a multi-tenant dashboard from React Navigation to Expo Router's file-based routing, we hit a silent performance cliff at 42 nested routes. Navigation animations dropped from 60fps to 38fps, and memory usage spiked by 140MB on Android mid-range devices. This benchmark isolates the breaking point.

Test Topology

Environment:

Expo SDK 52, React Native 0.76

Test devices: Pixel 5 (Android 13), iPhone 12 (iOS 17)

Profiling: React Native Performance Monitor + Android Studio Memory Profiler

Load harness: Automated UI test cycling through 10/25/50/75 nested (tabs) and [id] dynamic routes

Route Structure:

app/ (auth)/ login.tsx (dashboard)/ _layout.tsx index.tsx [tenant]/ settings/ [section]/ [subsection]/ index.tsx // Depth = 6 levels

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Metric Comparison Table

Route Depth Avg Navigation Time (ms) Memory Delta (MB) Frame Drops (per transition) UI…