compose-performance

name	compose-performance
description	Use when investigating Jetpack Compose recomposition cost, compiler stability reports, skippability, unstable parameters, frame-rate State reads, cross-phase snapshot back-writing, or @ReadOnlyComposable contracts.

Compose performance

Core principle

Measure one user-visible transition, identify the runtime axis that causes the work, then apply the smallest correction at the phase or boundary where that axis begins.

Procedure

1. Reproduce one concrete transition and capture the observable evidence: recomposition counts, compiler reports, profiler data, or a clear trace.
2. Classify the primary axis: parameter stability and skipping, State read phase, or snapshot state written back into an earlier phase.
3. Check for a false lead: a real data change, a correctness defect, or an unchanged lazy item that is expected to recompose.
4. Read the corresponding focused reference before proposing a change.
5. Change one axis at a time and re-measure the same transition.
6. Finish when the evidence improves at the observed boundary without hiding state changes, caching stale values, or moving work to a less correct owner.

Topic router

Signal	Read
Cause is unknown, or several axes may interact	Diagnosis
classes.txt, composables.txt, strong skipping, unstable parameters, or collection stability	Stability
Scroll, animation, gesture, layout, or draw State read at frame rate; measured state fed back into composition	Deferred reads
A composable only reads composition locals or accessor-style values	Composition contracts
State ownership or effect lifecycle is the root cause	Compose state and effects

RED/GREEN agent scenarios

1. RED blames unstable parameters for unchanged lazy rows that recompose during a focus transition. GREEN checks composition and layout back-writing first.
2. Novel case: an animation value controls only drawing. GREEN reads the State in a draw or layout lambda instead of propagating it through composition.
3. Counterexample: a screen visibly recomposes because its displayed model actually changed. GREEN does not add stability wrappers or caches merely to lower a count.