[iOS] Rendering of CollectionView takes too much time

[unombun]

Description

Navigate to a page that contains inside a CollectionView. Rendering of the CollectionView takes too much time.

Steps to Reproduce

1. Create a page that contains a CollectionView with only 15 items.
2. The ItemTemplate should be realistic one, but not mandatory too complex.
3. When navigating to the page, the rendering of the CollectionView takes 2-3 seconds.
4. If the data of the CollectionView is set (through binding) in OnAppearing, when users tries to navigate to the page, the navigation takes too much, so the user does not see anything happening for 2-3 seconds. If the date is set in OnNavigatedTo, the page is shown right away but the rendering of the CollectionView takes 2-3 seconds.

Link to public reproduction project repository

https://github.com/flesarradu/TestProject-JonChanges

Version with bug

7.0.86

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, Windows

Affected platform versions

Did you find any workaround?

No

Relevant log output

No response

[Symbai]

Dupe of #14591

[BenBtg]

I am working with the customer that raised this issue. I do not believe it is a dupe of #14591
This is specifically about CollectionView performance. The mentioning of OnNavigatedTo is just to demonstrate how to repo the issue. @unombun can you confirm this?

[Symbai]

This is specifically about CollectionView performance

Yes, have you read the entire posts in #14591 ? They mention collectview takes very long to render (when a user navigates to). Exactly what this issue here claims.

[unombun]

Dupe of #14591
I am not sure is really a duplicate of #14591. That one is about performance regarding Shell Navigation, while this one is really focusing on CollectionView performance

[unombun]

I am working with the customer that raised this issue. I do not believe it is a dupe of #14591 This is specifically about CollectionView performance. The mentioning of OnNavigatedTo is just to demonstrate how to repo the issue. @unombun can you confirm this?

Yes, when using OnNavigatedTo the navigation performs well, the CollectionView still does not render properly

We've added this issue to our backlog, and we will work to address it as time and resources allow. If you have any additional information or questions about this issue, please leave a comment. For additional info about issue management, please read our Triage Process.

[rachelkang]

@jonathanpeppers any thoughts/ideas here?

[jonathanpeppers]

rendering of the CollectionView takes 2-3 seconds.

Is this number from running in Debug or Release mode? Which platform?

If you are seeing it only in Debug mode, you can try UseInterpreter=false in your .csproj. This will disable C# hot reload, but performance will be generally better.