navigating back and forth between two composable f...

# compose

[myanmarking]

navigating back and forth between two composable fragments sometimes cause a ‘lag’ navigating back and i narrowed it down to this composable:

Image(
    modifier = Modifier
        .fillMaxSize(),
    painter = painterResource(id = state.itemList[page].imageRes),
    contentDescription = null,
    contentScale = ContentScale.Crop
)

This is loading a webp image. Maybe it is related to the image size. But most of the times it has no lag. What could it be ?

[Zach Klippenstein (he/him) [MOD]]

Does it only lag the first time a given resource is shown?

[myanmarking]

no. it is random. i would say 1 time out of 5. I’m investigating the issue with @Stable wrapper list

[myanmarking]

nah. its the same =(

[myanmarking]

i can send you a video by pm if you want. Can’t post here

[Zach Klippenstein (he/him) [MOD]]

have you attached the profiler?

[myanmarking]

I’ll when i get the time

[Adam Powell]

if you suspect it might be related to the image size then it probably is. ui.perfetto.dev is the best way to see where time is going; the usual stuff around only measure performance on a release build applies here too. Very large images can take significant amounts of time to upload to the gpu, and if you have a large image resource that isn't in a drawable-nodpi resource folder the system may be upscaling it and making the problem even worse

[myanmarking]

ya, maybe. But it behaves normally with non-compose view

[myanmarking]

i’ll check. thanks