Java Android Runtime Performance Audit

Instructions

Performance work is measurement-first. Do not optimize without a trace.

1. Establish a Baseline

Measure these before changing any code:

• Startup time — adb shell am start -W ... → TotalTime, WaitTime.
• Frame rate — Profiler → CPU → System Trace, or Macrobenchmark library.
• Memory — Profiler → Memory → record allocations.
• Network — Profiler → Network timeline.

Save traces in docs/perf/ with a date; every future change compares against the baseline.

2. StrictMode — catch main-thread IO immediately

Enable StrictMode in debug builds only: