Performance issue in lazy grid

[PauliusVal]

Description
Compose performance issue in super simple app which just displays network images list using Coil.

We see noticeable jank while scrolling even though:

• app runs in R8 release mode
• contains baseline profile for scrolling screen
• stable Compose parameters used
• unique and stable item keys applied for grid items

Jank is visible by human eye and also in profiler:
https://github.com/PauliusVal/ComposeGridPerformance/blob/main/images/images_grid_janky_frames_1.png?raw=true

Full app code and more screenshots: https://github.com/PauliusVal/ComposeGridPerformance/tree/main

Version
Coil version: io.coil-kt:coil-compose:2.4.0

[colinrtwhite]

Thanks for the repro project. Which device did you run the tests on?

[PauliusVal]

Samsung S21 Ultra, Android 13

[PauliusVal]

Not sure if that helps, but updated the app with identical grid just with Glide image loading. It has noticeably fewer janky frames in profiler and looks/feels much smoother.

[Mkohm]

Same problem here, seems to use a lot of memory! Up to 2gigs of memory in my app when scrolling in lazy column with images.

[lkhore]

Same issue janky frames with grid

[colinrtwhite]

@Mkohm That sounds like it could be a separate memory leak. Please file an issue (ideally with a way to reproduce)!

@lkhore Did you test in release mode? Compose is often much slower in debug mode.

[serhatkarakoca]

Same problem in release and debug mode.

[Kuki93]

Is there any progress on this issue

[matejdro]

I've added benchmark and tracing here to make diagnosing this easier: matejdro/ComposeGridPerformance@beb902c

Here is an example trace file (from Pixel 7 Pro): ScrollBenchmark_scrollImageList_iter003_2023-12-21-08-27-41.perfetto-trace.zip

Not sure why the trace is so weird (it shows one big compose event spanning multiple seconds), but you can still drill down and it appears that rememberAsyncPainter is taking considerable time:

[hellosagar]

Im noticing a heavy jank in scrolling with LazyGrid as well. In my application compose:lazylist:prefetch:measure is taking around 229.935506 ms 👀

[musooff]

I am simple loading local images and showing with coil. There is a noticeable lagging (skipping lots of frames) especially in older devices.
During first showing of the LazyVerticalGrid it is almost unusable.
Below is the video to show the lag with HWUI rendering.
And yes, it is in release mode. In debug you can't even scroll.

coil.performance.mov

[felipef0xx]

Same problem here with Coil's Compose Sample:

Screen_Recording_20240207_165837_Coil.mp4

Coil version: 2.5.0
Device: Galaxy M23 5G

[felipef0xx]

It looks like it's not just related to LazyGrid.
Changed the Compose Sample to LazyColumn and the problems still happen:

Screen_Recording_20240208_133733_Coil.mp4

[mainrs]

Hope I can somehow help with this. I am using LazyColumn and each item has an AsyncImage ("episode item"). Is there anything I can provide: debug logs, source code, ....?

[x3x0z]

I have the same error, I'm using a LazyVerticalGrid with +8k items (I'm also using pagination), after fast scrolling through more than 3k items, the application gets super slow, even the android emulator stops working.

[Cj-Rodriguez101]

Hope I can somehow help with this. I am using LazyColumn and each item has an AsyncImage ("episode item"). Is there anything I can provide: debug logs, source code, ....?

Does it still happen on 2.6.0?