Mobile Performance Analysis and Profiling Questions

Techniques and tooling for analyzing and improving mobile application performance across iOS and Android. Covers using profilers and trace tools (for example Android Studio Profiler, Perfetto, systrace, and Xcode Instruments) to measure CPU usage, memory usage, rendering frame times, and battery impact; interpreting traces and flame graphs; identifying common bottlenecks such as excessive allocations, UI thread contention, and expensive layout passes; and applying remediation strategies like object pooling, lazy initialization, batching, and image decoding optimizations. Candidates should be able to walk through analyzing a performance regression, propose a prioritized remediation plan, and describe how to validate improvements with measurable metrics.