flutter-perf-isolates

Use when DevTools shows UI-thread frames blocked by Dart computation. Decides whether and how to move CPU-heavy Flutter work off the main isolate using Isolate.run or compute: large CSV parsing, bulk categorisation, pattern or recurrence detection, big JSON parsing, image manipulation, large local analytics. Do not use for ordinary network or async I/O, or for small computations where isolate overhead exceeds the work.