Slow Collectionview Rendering performance in Maui compared to Xamarin

[brentpbc]

Description

I am currently migrating our existing LOB app that is on the iOS app store from Xamarin Forms to .Net Maui and I am noticing performance issues in the Maui version compared to the Xamarin version. This is most noticeable when testing on older slower devices such as the 2018 6gen iPad we have access to which is a good representation of the devices our customers would be using.

I have created an example repo https://github.com/brentpbc/maui-xam-testing.git that contains a Xamarin solution and a Maui solution, both have essentially the same code. In the test app there is a "CollectionView2 Page" button, in the Maui version after tapping the button there is a delay navigating to the "CollectionView2 Page" which is not present in the Xamarin version and then once the page is displayed the scroll stutters and doesn't match the performance of the Xamarin version. Both versions were built in Release mode when comparing. See below screen recordings for a comparison.

Xamarin solution: https://github.com/brentpbc/maui-xam-testing/tree/main/CollectionViewTesting1/CollectionViewTestAppXam
Maui solution: https://github.com/brentpbc/maui-xam-testing/tree/main/CollectionViewTesting1/CollectionViewTestAppMAUI

MAUI ios Simulator iPad 6Gen Speedscope File: https://github.com/brentpbc/maui-xam-testing/blob/main/CollectionViewTesting1/Speedscope/iPad_6gen_sim_CollectionViewTestAppMAUI.speedscope.json

Xamarin Screen Recording:
https://github.com/brentpbc/maui-xam-testing/raw/main/CollectionViewTesting1/ScreenRecordings/iPad_6gen_device_Xamarin.mp4

iPad_7_Xamarin.mp4

Maui Screen Recording:
https://github.com/brentpbc/maui-xam-testing/raw/main/CollectionViewTesting1/ScreenRecordings/iPad_6gen_device_Maui.mp4

iPad_7_Maui.mp4

Steps to Reproduce

1. Clone repo
2. Build Xamarin Version https://github.com/brentpbc/maui-xam-testing/tree/main/CollectionViewTesting1/CollectionViewTestAppXam in release
3. Build Maui Version https://github.com/brentpbc/maui-xam-testing/tree/main/CollectionViewTesting1/CollectionViewTestAppMAUI in release
4. Open the Xamarin app and tap "CollectionView 2 Page" button and scroll list
5. Open the Maui app and tap "CollectionView 2 Page" button and scroll list and compare time to load page + scrolling performance to xamarin.

Link to public reproduction project repository

https://github.com/brentpbc/maui-xam-testing.git

Version with bug

8.0.80 SR8

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android

Affected platform versions

No response

Did you find any workaround?

No

Relevant log output

No response

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it. Thank you!

Open similar issues:

• [Android] CollectionViewwith multiple bindable layouts (CardWithComplexContent) performance issues (#21580), similarity score: 0.86

Closed similar issues:

• Maui Performance Issues (#14227), similarity score: 0.85
• [WinUI] CollectionVIew scrolling performance (#18510), similarity score: 0.82
• [Android] CollectionVIew scrolling performance on MAUI lags compared to XF (#18505), similarity score: 0.81
• [Android][CollectionView]MAUI is too much slower than XAMARIN (#18531), similarity score: 0.81

Note: You can give me feedback by thumbs upping or thumbs downing this comment.

[Zhanglirong-Winnie]

This issue has been verified using Visual Studio 17.11.0 Preview 7.0 (8.0.80 & 8.0.40 & 8.0.3 & 7.0.101). Can repro on iOS and Android platforms.

[brentpbc]

Any updates on this?

[SethupathyD]

Hi .NET MAUI team,

we are also encountering the same issue on android platform. Could you please provide an update on the status of this issue and an estimated timeline for a fix?

Thank you for the support.

Regards,,
Sethupathy D.

[jonmdev]

For cross referencing I believe I have found one of the causes (if not the main cause) of the poor performance in scrolling/translation in iOS Maui. Every time you change the translation of any objects in iOS, Maui is causing the whole hierarchy to re-arrange itself and re-measure itself in iOS. This is not happening in Android/Windows.

I have shared my bug report here which demonstrates the issue: #24996

[IliyanPopov]

Important observation:
I’ve noticed similar lagging performance in the app I’m working on when built with Xcode 15.4.
However, after updating the build pipeline to use Xcode 16.0, performance has improved significantly. While it’s still not on par with the Xamarin.Forms version, it seems like it might do the job.

[brentpbc]

Added Speedscope file to isolate navigation to Collection View 2 page. https://github.com/brentpbc/maui-xam-testing/blob/2ab538c0ed68c6170d7558be4370f35bb4988bee/CollectionViewTesting1/Speedscope/iPad_6gen_sim_CollectionViewTestAppMaui_Nav_cv2.speedscope.speedscope.json

For #22793 (reply in thread)