Mobile Performance Profiling

Identify and fix performance bottlenecks in mobile applications. Covers CPU profiling, memory leak detection, frame rendering analysis, network waterfall optimization, battery consumption tracking, and the patterns that keep mobile apps fast and responsive.

Mobile Performance Profiling is the practice of measuring and diagnosing the runtime behavior of mobile applications to identify bottlenecks in CPU, memory, network, and rendering. It matters when an app feels sluggish, crashes under load, or fails to meet performance SLAs—especially during user onboarding, onboarding flows, or when transitioning between screens. It is essential during feature development, before major releases, and when diagnosing user-reported slowness.

Capturing Performance Traces

To profile a mobile app effectively, you must capture a full, timeline-based trace of execution from launch to a specific user action. This requires instrumenting the app and collecting data from the device’s hardware and OS.

Launching a Trace on Android

On Android, use adb to start a trace session with the system-level profiler:

adb shell am start -n com.example.app/.MainActivity
adb shell cmd trace start -a com.example.app -o /sdcard/performance-trace.trace -t 30

This command starts tracing for 30 seconds on the app package com.example.app, capturing CPU, memory, and I/O events. After the app completes its task, stop the trace:

adb shell cmd trace stop
adb pull /sdcard/performance-trace.trace ./performance-trace.trace

The resulting .trace file can be opened in Android Studio’s Profiler or in Systrace.

Launching a Trace on iOS

On iOS, use xcrun to capture a trace via Instruments:

xcrun instruments -t "Time Profiler" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D ./performance-trace.trace -k "com.apple.instruments.trace" -D ./performance-trace.trace -w "iPhone 14" -D 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