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1.6 KiB
1.6 KiB
Mobile Perf/Memory Checklist (Large Lists)
This checklist is for preventing and diagnosing memory leaks and performance regressions in the mobile ticket list and other large virtualized lists.
Guardrails (code)
- Use
FlatList/SectionListvirtualization props (windowSize,maxToRenderPerBatch,removeClippedSubviews) and keep them stable. - Avoid re-render storms:
- Memoize row components (
React.memo) and pass stable callbacks (useCallback). - Avoid creating inline objects/functions in
renderItem/rows where practical.
- Memoize row components (
- Prefer incremental pagination over “load everything”.
- Avoid retaining large arrays in module-level singletons; cache with TTL and explicit clear actions.
Profiling checklist (manual)
iOS
- Use Xcode Instruments:
- Leaks: verify no growth while scrolling up/down for 2–3 minutes.
- Allocations: look for steadily increasing allocations while list is idle.
- Time Profiler: look for hot components during fast scroll.
Android
- Use Android Studio Profiler:
- Memory: watch for heap growth that doesn’t return after GC.
- CPU: confirm smooth scrolling (no repeated long JS frames).
Common scenarios to test
- Typing into ticket search quickly (ensure request cancellation + no UI jank).
- Switching filters repeatedly, then scrolling.
- Opening/closing ticket detail repeatedly from the list.
- Background → foreground resume with refresh enabled.
Regression indicators
- Memory baseline increases continuously across repeated list scroll passes.
- “White screen” pauses or dropped frames during scroll.
- Increased API request fan-out (duplicate concurrent GETs).