MetricKit for SwiftUI Apps: Real-World Performance After Launch
The App Store release is the start of performance work, not the end.
Most teams test performance before launch. Fewer teams monitor what happens after real users install the app on real devices.
That gap is expensive. A SwiftUI app can pass QA and still suffer from slow launches, memory pressure, animation hitches, disk usage growth, or hangs under real-world conditions.
MetricKit helps close that gap by delivering performance metrics and diagnostics from actual device usage. For template-based SwiftUI apps, this is a practical way to detect regressions after customizing the base code.
This guide covers:
- what MetricKit measures;
- which metrics matter for SwiftUI apps;
- how to connect diagnostics to product areas;
- what to monitor after a template customization;
- how to build a release performance checklist.




