IssueTracker

b/245449784 can have some benchmarks for such cases. And there is a third party user provided sample project: https://github.com/DaFaack/ComposePerformanceTest

Project: platform/frameworks/support
Branch: androidx-main

commit 69c9a580f0bf6f05163b711e5c1978f383f99402
Author: Andrei Shikov <ashikov@google.com>
Date:   Tue Oct 11 02:33:32 2022

    Reuse nodes across subcompose layout boundary
   
    Enables reuse for subcompose layout node triggering reuse instead of dispose whenever composition is put inside ReusableContent. Subcomposition dispose is tied to `onDetach` of the corresponding node instead, which is triggered when node exits composition entirely.
   
    Reusing nodes should improve performance in subcompose layouts inside lazy containers.
   
    Fixes: 252846775
    Test: LazyColumnTest/SubcomposeLayoutTest
    Change-Id: If2df818639223abfa9d8d1e48af74b8f9e3ceeb1

M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/grid/LazyGridSlotsReuseTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/layout/LazyLayoutTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/list/LazyColumnTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/list/LazyListSlotsReuseTest.kt
M       compose/integration-tests/macrobenchmark-target/src/main/AndroidManifest.xml
A       compose/integration-tests/macrobenchmark-target/src/main/java/androidx/compose/integration/macrobenchmark/target/LazyBoxWithConstraintsActivity.kt
A       compose/integration-tests/macrobenchmark/src/androidTest/java/androidx/compose/integration/macrobenchmark/LazyBoxWithConstraintsScrollBenchmark.kt
M       compose/ui/ui/src/androidAndroidTest/kotlin/androidx/compose/ui/layout/SubcomposeLayoutTest.kt
M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/layout/SubcomposeLayout.kt
M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/node/LayoutNode.kt
M       tv/tv-foundation/src/androidTest/java/androidx/tv/foundation/lazy/grid/LazyGridSlotsReuseTest.kt
M       tv/tv-foundation/src/androidTest/java/androidx/tv/foundation/lazy/list/LazyListSlotsReuseTest.kt

https://android-review.googlesource.com/2247915

Project: platform/frameworks/support
Branch: androidx-main

commit 6f2e0ab896044dbc21a00cf28f65b9df962fb192
Author: Andrei Shikov <ashikov@google.com>
Date:   Wed Dec 21 00:10:54 2022

    Reuse nested compositions in SubcomposeLayout
   
    Updates `SubcomposeLayout` to reuse subcompositions when the layout itself is reused. Subcompositions are kept around if the `SubcomposeLayout` node is reused or deactivated and are disposed on release.
   
    Adds a interface for subcompositions with overloaded `setContent` that forces reuse to work around same-frame reset/composition cycle.
   
    Test: Updated UI/foundation tests
    Relnote: """Add `ReusableComposition` interface for managing lifecycle and reuse of subcompositions."""
    Fixes: 252846775
   
    Change-Id: I812d1fa36791857a04471882d5edabea1400c15e

M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/grid/LazyGridSlotsReuseTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/layout/LazyLayoutTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/list/LazyColumnTest.kt
M       compose/foundation/foundation/src/androidAndroidTest/kotlin/androidx/compose/foundation/lazy/list/LazyListSlotsReuseTest.kt
M       compose/runtime/runtime/api/current.txt
M       compose/runtime/runtime/api/restricted_current.txt
M       compose/runtime/runtime/src/commonMain/kotlin/androidx/compose/runtime/Composer.kt
M       compose/runtime/runtime/src/commonMain/kotlin/androidx/compose/runtime/Composition.kt
M       compose/runtime/runtime/src/nonEmulatorCommonTest/kotlin/androidx/compose/runtime/CompositionReusingTests.kt
M       compose/ui/ui/src/androidAndroidTest/kotlin/androidx/compose/ui/layout/SubcomposeLayoutTest.kt
M       compose/ui/ui/src/androidMain/kotlin/androidx/compose/ui/platform/Wrapper.android.kt
M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/layout/SubcomposeLayout.kt
M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/node/LayoutNode.kt
M       compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/platform/Subcomposition.kt
M       compose/ui/ui/src/skikoMain/kotlin/androidx/compose/ui/platform/Wrapper.skiko.kt
M       tv/tv-foundation/src/androidTest/java/androidx/tv/foundation/lazy/grid/LazyGridSlotsReuseTest.kt
M       tv/tv-foundation/src/androidTest/java/androidx/tv/foundation/lazy/list/LazyListSlotsReuseTest.kt

https://android-review.googlesource.com/2404404