[Performance] CollectionView slow first render

[OvrBtn]

Description

Context

This is a dupe of #15204 I'm creating this issue to throw in here anything I find/record while testing to avoid making a bunch of messy comments in original issue.

All the videos were recorded on physical android device (Samsung Galaxy A50) in release configuration.
All dotnet-traces were recorded using android emulator in release configuration.

This issue was also present in .net 7, I haven't tested version before.

Using a fork last synced on 24.09.24 - issue is still present.

Issue showcase

Using linked repro

Screen_Recording_20240929-220529.mp4

Simplified situation with CollectionView having just 1 element, demo running in Maui.Controls.Sample.Sandbox

Here I've copied to MAUI's codebase XAML and code from linked repro - SimpleCollectionView1Page and it's ViewModel and Model to be exact.

Screen_Recording_20240929-221548.mp4

Even with single element in CollectionView navigation is still slow.

Here is a recorded dotnet-trace:
maui-app_20240929_201458-SimpleCV-WithCV.speedscope.json

Similar situation like above but the CollectionView is removed and only what was in the DataTemplate is left as content of the page

Screen_Recording_20240929-222021.mp4

As you can see navigation is faster.
I made this recording to show that probably the CollectionView is at fault. Maybe by comparing dotnet-trace someone will catch something?

Recorded dotnet-trace:
maui-app_20240929_090419-SimpleCV-WithoutCV.speedscope.json

Steps to Reproduce

Videos should show everything, if something is not clear please let me know.

Link to public reproduction project repository

https://github.com/OvrBtn/MAUIPerf

Version with bug

Unknown/Other

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response

[similar-issues-ai]

We've found some similar issues:

• CollectionView is slow to initialize with complex ItemTemplate #22956 , similarity score: 82%
• Horrible performance/memory usage with CollectionView depending on size on screen #12013 , similarity score: 82%
• Slow Collectionview Rendering performance in Maui compared to Xamarin #24224 , similarity score: 82%
• [Android] CarouselView + CollectionView performance issues #23715 , similarity score: 81%
• .NET MAUI RC1 - CollectionView extremely slow #6317 , similarity score: 81%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

Note: You can give me feedback by 👍 or 👎 this comment.

[OvrBtn]

@jonathanpeppers sorry for ping but in the original issue you asked for .speedscope so maybe you will find this useful.

[OvrBtn]

I guess the most eye catching difference is the measurement
Example with CollectionView:

Example without CollectionView:

Exactly the same stuff to draw on screen and yet huge difference.

[Zhanglirong-Winnie]

This issue has been verified using Visual Studio 17.12.0 Preview 3(8.0.92& 8.0.90). Can repro this issue on android platform.