Is it just me or is `LazyColumn` rather laggy on f...
# composeu
ursus
08/01/2021, 1:03 PMIs it just me or is
LazyColumn➕ 13
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Shakil Karim
08/01/2021, 1:07 PMDid you try on the Realese build? Performance on release build is much better.
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Namig Tahmazli
08/01/2021, 1:39 PMYeah it is same on my side as well. Tried on release build. Also bottom navigation item switching is lagging as well.
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ursus
08/01/2021, 2:12 PM@Namig Tahmazli does release make it better? ofcourse new AS won't sign my release build and I gave up
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Se7eN
08/01/2021, 2:14 PMI have a grid using LazyColumn\LazyVerticalGrid and it's a nightmare using it on Android 6. It's like the app is running on 5 fps.
RecyclerView worked great on Android 6.
I'm working on a reproducible example rn to file an issue
Se7eN
08/01/2021, 2:16 PMRelease makes it better but it's still really slow in my case and I can't release the app for production
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Shakil Karim
08/01/2021, 2:26 PMHopefully "Support multithreaded scheduler" on the compose roadmap will improve performance 🤞
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Namig Tahmazli
08/01/2021, 2:40 PM@ursus I did not see noticeable difference when using release build. It starts lagging initially and then becomes smoother.
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Zach Klippenstein (he/him) [MOD]
08/01/2021, 4:29 PMThat “slow at first, then better” sounds like it might be a JIT compilation thing. I’m not sure what the current status is but I think the Compose team is working to provide optimization profiles for the play store so that android will AOT compile hot Compose code before you run the app – that might address this issue. I’m also not sure how those work for sideloaded apps, other app stores, etc.
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Michal Klimczak
08/01/2021, 5:48 PMhttps://developer.android.com/jetpack/compose/ergonomics#profile-inst
Theoretically it should only be an issue on debug builds. I think Adam Powell also mentioned that minifying might be beneficial
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Colton Idle
08/01/2021, 6:09 PMIf you have a repro case of really bad perf, I would file a bug. Romain has said that they are taking a look at each perf issue closely.
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Namig Tahmazli
08/01/2021, 6:34 PMI tried it on Jetsnack, release build, minify enabled. I am able to reproduce lagging when switching tabs. If feels like some heavy data is being loaded on each screen when switching to.
Same applies to LazyColumn. 🤷♂️
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Colton Idle
08/01/2021, 6:56 PMI'd file a bug with exactly that information then. 😅
I'll star it if you post it here.
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deviant
08/02/2021, 7:49 AM@Zach Klippenstein (he/him) [MOD] in other words, compose apps will run smoothly only when downloaded from playstore? great
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Zach Klippenstein (he/him) [MOD]
08/02/2021, 1:34 PMI hope not, as I said I believe the play store is one way these profiles can be delivered but I’m sure there are others
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Se7eN
08/02/2021, 3:23 PMI created an issue: https://issuetracker.google.com/issues/195257410
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ursus
08/02/2021, 7:52 PMI dont feel like this is a JIT issue, since Column with versictalScroll works fine, I think its related to the lazyness; but I dont really know
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Zach Klippenstein (he/him) [MOD]
08/02/2021, 7:58 PMWell they have very different implementations, and lazy lists do a lot more work, so it could be that they benefit more from AOT
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ursus
08/02/2021, 9:01 PMI mean yea I expect debug builds to be slower even with recyclerview, and app startup etc, but this is a bit lot, not really prod ready tbh, and its a hello world app for me, just a simple card list layout
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