StateFlow is a Kotlin tool that helps your app react to changes smoothly. It updates UI only when data changes, so your app uses less CPU and battery. It supports 60 frames per second (fps) easily, keeping animations and scrolling smooth. Memory use is low because StateFlow keeps only the latest value, not a history.
To keep your app fast, avoid heavy work inside StateFlow collectors. Use map or combine operators to prepare data before UI updates. Use distinctUntilChanged() to skip unnecessary UI refreshes. Collect StateFlow in lifecycle-aware scopes to avoid leaks and wasted CPU when UI is not visible.
StateFlow is part of Kotlin Coroutines, which adds a small library size (~200KB). This is small compared to typical app sizes and does not noticeably slow startup. Using StateFlow can reduce code complexity, which helps keep your app smaller and easier to maintain.
StateFlow is Android-specific and built on Kotlin Coroutines. iOS apps use Swift Combine or SwiftUI's @State for reactive state. When sharing code with Kotlin Multiplatform, StateFlow can be used in shared modules, but UI code differs per platform. Android requires lifecycle-aware collection to avoid leaks; iOS uses different lifecycle management.
Likely you are doing heavy work inside StateFlow collectors or blocking the main thread. Also, you might be collecting StateFlow without lifecycle awareness, causing wasted CPU. Optimize by moving heavy tasks off the main thread and using distinctUntilChanged() to reduce unnecessary updates.