Users abandon apps that feel slow—often after a single janky screen transition. Performance is a feature that protects retention and app store ratings.
Use this checklist before every major release to catch regressions early.
Metrics to Track
Monitor cold start time, time-to-interactive, frame drops during scroll, API latency on cellular networks, and crash-free sessions.
Performance Targets
| Metric | Target | Tooling |
|---|---|---|
| Cold start | < 2.5s on mid-range devices | Firebase Performance |
| API p95 | < 800ms on 4G | APM + backend logs |
| Crash-free users | > 99.5% | Crashlytics / Sentry |
| List scroll | 60fps sustained | Profiler + systrace |
Key Takeaways
- Profile on real devices—not simulators alone.
- Cache aggressively but invalidate intelligently.
- Reduce image payload sizes with modern formats.
How VanTroZ Can Help
Our team helps organizations plan, build, and scale digital products with the right architecture, delivery model, and long-term support.
Related Resources
- Explore our service catalog.
- Explore our technology stack.
- Explore our case studies.
- Explore our contact our team.
- Read also: React Native vs Flutter: A Practical Mobile Framework Guide.
- Read also: Progressive Web Apps: Bridging Web and Mobile Experiences.
Tags
Mobile Performance
Optimization
React Native
Flutter
