How to Optimize Compose Compiler Optimizations

 

1. Leverage Stable and Immutable Types

• Annotate your data models with @Stable or @Immutable.

• Prefer using primitive types and immutable data classes in composable parameters.

• Avoid passing mutable or non-observable types as parameters.

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2. Keep Composables Small and Focused

• Break down large composable functions into smaller, single-responsibility components.

• This lets Compose (and the compiler) minimize the scope of recompositions.

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3. Use remember and rememberSaveable Properly

• Use remember to store objects or state that should persist across recompositions.

• Use rememberSaveable for state that must survive process death (with types supported by Bundle).

• Avoid initializing objects or expensive computations directly in composables—use remember to cache them.

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4. Avoid Unstable Objects in Parameters

• Don’t pass new objects, collections, or lambdas directly as parameters (e.g., List, lambda {}).

• If you must, use remember or wrap them in a stable class.

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5. Use Keys in Dynamic Lists

• In LazyColumn, LazyRow, etc., always provide a unique key for items.

• This helps Compose match slot tables and avoid recomposing unchanged items.

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6. Apply movableContentOf for Movable UI Blocks

• Use movableContentOf to move composables efficiently in the hierarchy without recomposition, such as in drag-and-drop, item reordering, or when you need to “teleport” content.

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7. Minimize Lambda Allocations

• Prefer stable, top-level, or remember-ed lambdas over inline lambdas.

• If a lambda doesn’t need to change, move it out or wrap with remember.

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8. Utilize Derived State for Expensive Computations

• Use derivedStateOf to memoize values that are calculated from other state, so they only recalculate when dependencies change.

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9. Avoid Passing State Directly to Deep Child Composables

• Lift state up and only pass the minimal, necessary data to child composables.

• Pass callbacks for actions, not the whole state object.

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10. Use Compose Compiler Metrics and Reports

• Enable Compose compiler metrics (metricsDestination, reportsDestination) to analyze where recompositions happen, stability info, and parameter tracking.

• Regularly review these reports to identify recomposition hotspots.

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11. Stay Updated with Compose Compiler Versions

• Always use the latest stable Compose Compiler and runtime libraries for the best optimizations and bug fixes.

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12. Mark Functions as Inline Where Appropriate

• Use inline keyword for small, frequently used functions—this can help reduce composable overhead in some cases.

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13. Avoid Recomposition Triggers in Parent When Possible

• Use rememberUpdatedState when passing changing state to long-lived side-effect composables (like LaunchedEffect), so parent recomposition doesn’t restart effects.

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14. Be Careful With State Hoisting

• Hoist only the necessary state up to avoid re-triggering recompositions at higher levels than necessary.

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15. Review Unstable Collections

• If you must use mutable collections, wrap them with stable interfaces or use observable state (e.g., SnapshotStateList, SnapshotStateMap).

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✨ Summary Table

Tip	What it Optimizes
Annotate models as Stable/Immutable	Parameter stability
Use remember, derivedStateOf	Avoid redundant work
Use keys in Lazy lists	Efficient item reuse
Keep composables small	Minimize recomposition
Use compiler metrics	Spot and fix bottlenecks
Avoid direct lambdas/objects in params	Parameter stability
Move lambdas/state up/out	Minimize allocations
Use latest Compose libraries	Leverage best compiler