Monitoring App Performance on iOS
Article Summary
Expedia's iOS team breaks down the complete performance monitoring toolkit every mobile team needs. Your users notice lag after just 300ms—here's how to stay ahead.
Corbin Montague from Expedia Group shares a comprehensive guide to iOS performance monitoring, covering everything from Apple's native tools to third-party solutions. This is the playbook for teams serious about app quality.
Key Takeaways
- Apple recommends 400ms cold launch: 100ms system init, 300ms for your views
- MetricKit delivers daily performance reports from production users with minimal code
- XCTest metrics can auto-fail CI builds when performance regresses from baseline
- Monitor 7 core metrics: app size, launch time, responsiveness, memory, battery, network, disk I/O
- Xcode Organizer provides free aggregated metrics but only for high-volume apps
Critical Insight
iOS developers get three powerful native monitoring tools (XCTest, MetricKit, Xcode Organizer) plus proven third-party options like Firebase Performance, all with implementation examples.
