We can t preload the list in compose so situations like Imag

Question

We can t preload the list in compose so situations like Image grid UX is not good Does anyone have a workaround around this

Chris Sinco [G] · Answer

Could you elaborate on image grid UX is not good We have LazyVerticalGrid now and you can use libraries to have placeholders for image loading Do you have an example of what you need want

allan.conda · Answer

Yes I m using that component Basically getting user complaints that they cannot see the images immediately when you scroll you have to scroll slowly to make sure it doesn t exceed the image you re looking for Does that make sense When using scrollbars it s fine to show placeholders because there s no way to preload and predict where the user is going to date sections are useful here but for normal scrolling user has to wait a bit for every scrolled page

Chris Sinco [G] · Answer

Are the images being loaded from the network Or is it scrolling jank Do you have a video of this issue

allan.conda · Answer

Thanks for asking I can t show my project but for the purposes of illustration I hacked around my personal app which also loads the device gallery I m censoring my personal images with colors Performance is really bad in my app for whatever reason though It s basically this but a lot faster but still perceptively slow Does this help Any maybe you have idea where this Jank is coming from I m using Paging and Coil here

allan.conda · Answer

And it s not limited to grid use cases I also have a vertical pager like TikTok If it only starts loading when I scroll then you see this blacks while the player is loading Unlike with ViewPagers where I can preload the adjacent items

Chris Sinco [G] · Answer

Hmm these do seem slow Have you seen the same issues on a release build

Chris Sinco [G] · Answer

On the preloading adjacent items are you using the Pager from Accompanist ccing < Andrey Kulikov> as well who might have more tips

Chris Sinco [G] · Answer

If you can share the code of these examples also that would be helpful for troubleshooting

Chris Sinco [G] · Answer

Also if you haven t already reviewed this it s a useful start We released it recently <https developer android com jetpack compose performance>

allan.conda · Answer

gt Have you seen the same issues on a release build This is release build sweat smile gt are you using the Pager from Accompanist VerticalPager on the second demo Kind of make sense because it s loading ExoPlayer which takes time gt If you can share the code of these examples also that would be helpful for troubleshooting I ll see what I can share