what are the best practices to eliminate these green bars? i'm rewriting app with compose. the recyc...

# compose

[deviant]

what are the best practices to eliminate these green bars? i'm rewriting app with compose. the recyclerview version was pretty smooth, but i can't reach same smoothness with LazyColumn like widgets. as i understand it's somehow related to animations, but i disabled all possible animations (crossfade, content size etc). also yes, i'm using r8 and release mode

[Filip Wiesner]

That is a very broad question. Have you read the Compose performance doc?

[deviant]

yep. i simplified the layout as possible. even load local images to exclude loading lib problems

[deviant]

my recyclerview full of bells and whistles works much smoother (loading animations, content rescale on loading)

[Isaac Udy]

I think that one of the most important things in the Compose performance doc is about running in release mode. Is this a debug application or a release application? This is one of the most simple things that you can do to improve Compose performance, but I find that it’s also one of those things that people skip (because building in debug mode is the default in Android Studio).

edit: I re-read the original post which says “also yes, i’m using r8 and release mode” right at the end, so this was a bit of a silly question to ask 🙃

[deviant]

i always run in release mode since debug mode is near to unusable, especially on the emulator

[Isaac Udy]

Is that graph in the screenshot from a physical device or an emulator?

[deviant]

it's xiaomi redmi note 9 pro

[Isaac Udy]

When you say “load local images”, what exactly do you mean? Are you loading those from resource files?

[curioustechizen]

I feel the best option would be to isolate a minimal repro and open a bug on the issue tracker. It is going to be very difficult to debug this without seeing some code.

[deviant]

Are you loading those from resource files?

yes

isolate a minimal repro

yep. trying to do it with minimal code.

[Isaac Udy]

What do the performance bars look like if you replace the Images with a Box(modifier = Modifier.background(Color.Cyan))? I’m wondering if something could be loading on the main thread when it shouldn’t be?

[ste]

Possibly https://issuetracker.google.com/issues/210040434

[Lukáš Kúšik]

open the layout inspector and check for any unnecessary recompositions during scroll

[deviant]

the thing is when i start layout inspector my app is crashing 🙂

[jasu]

Not sure if you’d have already done this but here is the very small list.

1. use keys for lazy column
2. try to make image model @Stable