IssueTracker

Jetpack Compose version: 1.2.1

Jetpack Compose component(s) used: material, constraintlayout

Android Studio Build: Android Studio Chipmunk | 2021.2.1 Patch 2

Kotlin version: 1.7.10

I've run into performance issues with LazyColumn that has many items that are ConstraintLayout. Depending on complexity of item layout and speed of scrolling, the framerate noticeably drops on fast scrolling or even many frames in a row are dropped.

• I test on release build ✅
• the release build has minifyEnabled and proguard-android-optimize.txt ✅
• I test on real devices as well as in emulator ✅
• checked that nothing triggers the recomposition more than necessary ✅
• checked that there are no heavy computations on recomposition ✅
• checked that all my composables are skippable and classes are stable ✅

Here I moved the problematic code to a sample project (so don't judge the design pls 🙈), so you can build / play with yourself: https://github.com/haluzpav/LazyColumnStutter

The problematic item layout: https://github.com/haluzpav/LazyColumnStutter/blob/minify_optimize_complex_item/app/src/main/java/com/lazycolumnstutter/ForecastItem.kt

You can find videos in attachments, with device names and Android version in file names. The shown performance problems happen also when not recording the screen. Curiously enough, performance in emulator (API 32) is fine. 🤨

I'm looking for suggestions how to improve this on my side.

Note: When I partially re-wrote the item layout to simple Rows/Columns (code) the performance is much better, although it still occasionally drops frames on real devices.