Performance work in Flutter: measuring in profile mode, moving CPU work off the UI isolate with compute and isolates, long scans that report progress, batching database writes, decoding images at the size they are drawn, scrolling cost in long lists, startup time and memory. Use when the app stutters, a scan or import freezes the UI, a list scrolls badly, memory grows with scrolling, startup is slow, or when reviewing code that processes many records or large files.
