PSA/ee/docs/plans/2026-02-03-alga-psa-mobile-app/PERF_MEMORY_CHECKLIST.md
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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/SectionList virtualization 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.
  • 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 23 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 doesnt 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).