Platform-View List / Grid scrolling is janky on IOS / Android #107486

Nico3652 · 2022-07-12T19:04:10Z

My team and I are facing troubles for a while trying to implements native views inside scrollable content in our App.

The real problem here is that the Platform View rendering is very heavy and as a consequence the scrolling animation make it visible on screen by lag / freezing the UI.
So when native views are placed into ListView / GridView, the entire screen start to freeze because of performance.

Here are 2 videos to illustrate my words. A simple ListView with widgets inside.
The first contain Flutter widgets and the second Native views.

FLUTTER :

Flutter	NATIVE (IOS)
Simulator.Screen.Recording.-.iPhone.12.Pro.Max.-.2022-07-12.at.20.25.20.mp4	Simulator.Screen.Recording.-.iPhone.12.Pro.Max.-.2022-07-12.at.20.26.00.mp4

This is a completely empty App so the freezing could may be not very pronounced here but a simple app with common content (ex: users/photos) is much more impacting.

It was record on IOS but clearly tested on Android too and the problem still persist.

Our App is a full social media (photo / video / story) and when we are trying to add native view inside lists, this app quickly become unusable.

Here are linked issues #96679 (which should not be closed)

GOOGLE ADS SDK

Also currently trying to provide Ads into our Social Media app between photo and videos lists, the performance issue is even worse than the recorded example here while scrolling or animating other components.

ADS are provided with Platform View so the problem is remaining once again here, and this is very restrictive for us because we can not go in production version without ADS and native view because of business model.

Linked issues :

googleads/googleads-mobile-flutter#269
googleads/googleads-mobile-flutter#313

This issue should have a high priority level taking into account the huge impact for company or developers teams into their app.

Thank you.

-- FULL CODE --

https://github.com/Nico3652/native_view_project

-- FLUTTER DOCTOR --

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The text was updated successfully, but these errors were encountered:

b3nni97 · 2022-07-13T02:29:45Z

I have the same problem #103014

euphio · 2022-07-13T06:59:02Z

+1 Also experiencing this issue and require the exact same use case as described above.

maheshj01 · 2022-07-13T11:21:23Z

Hi @Nico3652, Thanks for filing the issue. Could you please share a minimal and complete sample project so that we could directly run the sample app? Also there have been recent updates to platform views, So I would suggest checking the performance on the latest master channel by running

flutter channel master
flutter upgrade

Nico3652 · 2022-07-13T16:14:02Z

Hello @maheshmnj and thanks for reply. I've updated my issue with the link of the sample app containing the full code which you can clone.

I tried the channel master but the problem is still present unfortunately.

maheshj01 · 2022-07-14T09:03:51Z

Thanks for the code sample @Nico3652, I do see the lag on the master channel too, But I believe this is the same issue as #103014 which uses Native ads using platformview. So I think we can track it as a duplicate?

Screen.Recording.2022-07-14.at.11.25.54.AM.mov

flutter doctor -v (mac)

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Nico3652 · 2022-07-14T09:29:39Z

This issue is focused on the platform view performance impact in its generality and not only for the Native ads SDK.
The goal here is to display any native views in flutter with the same performances than other flutter widgets.

Solve the platform view issue will certainly also solve the ads performance but I'm not sure the other way around.
If the google_ads_sdk is improved or workarounded one way or another without fixing the platform view render, #103014 could be closed, then this issue should remain.

euphio · 2022-07-14T09:33:41Z

Agreed, the Native ad issue appears to be a symptom of this more general performance problem, not the other way around.

maheshj01 · 2022-07-14T10:37:35Z

Thanks for the clarification @Nico3652, Labeling it as a platformview performance issue on IOS. Perhaps for Android, we should track it separately. Sample project can be found here native_view_project.zip

flutter	Platformview
Screen.Recording.2022-07-14.at.11.26.22.AM.mov	Screen.Recording.2022-07-14.at.11.25.54.AM.mov

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jmagman · 2022-07-14T17:42:17Z

@cyanglaz do we have any benchmarks for this?

cyanglaz · 2022-07-14T20:12:22Z

@cyanglaz do we have any benchmarks for this?

I think we do: https://github.com/flutter/flutter/tree/master/dev/benchmarks/platform_views_layout

Tom3652 · 2022-07-19T09:42:25Z

This issue is preventing me from going in production unfortunately

cyanglaz · 2022-07-19T18:35:45Z

@Tom3652 iOS PlatformView requires all flutter compositing happen on the main thread, which slows down the performances, especially when there are many platform views in a scroll view.
See: https://docs.flutter.dev/development/platform-integration/ios/platform-views?tab=ios-platform-views-objective-c-tab#performance

May I ask what content are you trying to display as PlatformViews? Is there a way to make them non-platformView flutter widgets?

b3nni97 · 2022-07-19T18:55:20Z

@cyanglaz One use case that concerns me is the display of ads that run entirely through Platform Views and not through Flutter Widgets.

euphio · 2022-07-20T10:53:15Z

My use case is essentially identical to that of @Tom3652 - Native Google Ads in a stream of content, although I can imagine there would be requirements for other native views in such a feed.

naamapps · 2022-07-21T09:29:09Z

Hey guys,
Adding to all of the previous comments,
The ideal solution will be not using PlatformViews at all when possible, however, the implementations of all the critical packages (ads in particular) are using platform views.

The Android platform views are fixed to a degree.
In iOS the situation is far worse.

I think the Flutter teams should really prioritize these issues. Most of the attention now are given to expanding flutter to more platforms (web, desktop), even when the initial platforms (iOS, Android) are not perfectly executed unfortunately.

Hope we can see a solution in the near future.
Thank you.

jmagman · 2022-09-01T18:05:19Z

iOS doesn't have a native support for displaying content in UIView in a texture, so a similar approach like Android is impossible on iOS.

We should revisit the iOS PlatformView's performance at some point to see if we can increase the performance within the current threading model for PlatformVIews.

Let's keep conversation focused on the performance issues related to platform view threading model on iOS. Please avoid adding noise to GitHub issues.

0xZOne · 2022-10-26T12:26:49Z

I have a similar problem too. #114010

The difference is that on non-ProMotion devices (e.g., iphone8) it's smooth with barely perceptible jitter. However, there is noticeable jitter on the ProMotion device (e.g., iPhone13 Pro Max).

@cyanglaz Here it seems to be more than just platform view performance issues.

0xZOne · 2022-10-27T03:20:30Z

I have a similar problem too. #114010

The difference is that on non-ProMotion devices (e.g., iphone8) it's smooth with barely perceptible jitter. However, there is noticeable jitter on the ProMotion device (e.g., iPhone13 Pro Max).

@cyanglaz Here it seems to be more than just platform view performance issues.

iPhone 8

iPhone 13 Pro Max

Actually, non-ProMotion devices will also experience jitter, but not as visible to the naked eye as ProMotion devices.

flutter doctor -v

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stuartmorgan · 2022-11-01T20:03:34Z

Capturing from offline discussion: the two main potential sources of perf issues here are:

thread merging, as discussed above, and
frequent creation and destruction of platform views as they scroll through.

As a next step here, we should compare perf of the scroll-lots-of-native-views test in the original report to scrolling the same list with just widgets, but with a platform view persistently on the screen, to isolate just the thread-merging part, to see to what extent each contributes to the issue.

cyanglaz · 2022-11-04T19:38:12Z

Performance comparison between multiple scenarios with iPhone 13 pro, with Flutter dev tools:

No PlatformView while scrolling:

One PlatformView, with the PlatformView stationary and non-flutter widgets scrolling. (Thread merging)

2* 5 PlatformViews, with the PlatformViews stationary

**One PlatformView, with the PlatformView constantly animating. **

5 PlatformViews in the list, no creation destruction during scrolling (This also matches the max number of PlatformView on the screen in the next scenario

4*. 30 PlatformViews in the list, no creation destruction during scrolling.

Multiple PlatformView scrolling (the scenario in this issue)

My observations:

Thread merging does reduce the performance, about 2ms per frame. (comparing scenario 1 and 2) This is expected.
One PlatformView animating its position reduces performance further more. (comparing scenario 2 and 3)
Animating the position of multiple PlatformViews with no creations and destructions reduces performance. (comparing scenario 3 and 4)
PlatformView creation and destruction doesn't seem to contribute to the performance reduction much. (comparing scenario 4 and 5)
The more the PlatformView animating, the worse the performance. (comparing 4 and 4*)
Number of the stationary PlatformView on the screen doesn't seem to affect performance (comparing 2 and 2*)

In summary, 2 things are happening that contributes the performance reduction.

Thread merging. This is expected and I'm not sure what we can do about it unless completely changing the threading model. The reduction is not much tho. I could not observe any janks when only 1 platform view is on the screen.
Numbers of the PlatformView constantly animating. It looks like the more PlatformView that are animating, the worse the screen jank is. There might be something we can do here.

The next step would be to find where in PlatformView's code takes long time during animation. My gut says it is either ApplyMutator is slow, or unnecessary overlays are created in SubmitFrame

cyanglaz · 2022-11-07T19:24:24Z

I found that setting the maskView is one of the bottlenecks that lowering down the performance, here

I have tried removing all the clipping logic and just setting the maskView, the performance is still as bad.

Plain mask view no clipping

No mask view

Masking is the probably the best way that I could find to clip a UIView. I'm not sure if we can avoid masking if we want to support clipping.

One thing that we might be able to optimize is to pre-calculate the final clip path for the PlatformView, check if the PlatformView's frame is completely inside the final clip path, and do not set the mask view if that is the case.
I think this is the case for the example app, the clip rect in the example is basically the entire section below the navigation bar and all the PlatformViews never really need to be clipped.

I will start prototype this and see if it increases performance. I believe (and hopefully) it will enhance performance for regular scrolling scenarios. Although it won't help if the App wants to do fancy clippings while scrolling. (For example, adding a clipRRect for each PlatformView in the ListView)

cyanglaz · 2022-11-09T00:20:29Z

The draft is ready at flutter/engine#37434. I have tested the performance with flutter dev tools it seems to have a significant performance increase while using the example app.

It would be great If anyone else can verify if it fixes the visual janks for their app.

0xZOne · 2022-11-16T13:45:04Z

@cyanglaz

Frame stuttering in PlatformView is far less noticeable on non-ProMotion devices than on ProMotion devices.

It might be a not-bad optimization option if we could lower the refresh rate to 60Hz for pages containing PlatformView. :)

Tom3652 · 2022-11-16T13:49:25Z

Hi @cyanglaz and thanks for working on this !

I am sorry but i am not sure on how to proceed to test your draft ? I would like to

0xZOne · 2022-11-16T15:03:07Z

Hi @cyanglaz and thanks for working on this !

I am sorry but i am not sure on how to proceed to test your draft ? I would like to

You can compile a local engine with @cyanglaz's patch (see https://github.com/flutter/flutter/wiki/Compiling-the-engine for details).

Working from home due to COVID-19, I only have an iPhone 8, no ProMotion device. Since the iPhone 8 has no noticeable stutter even without the patch, I can't verify that well either.

0xZOne · 2022-12-02T03:44:03Z

@cyanglaz

Frame stuttering in PlatformView is far less noticeable on non-ProMotion devices than on ProMotion devices.

It might be a not-bad optimization option if we could lower the refresh rate to 60Hz for pages containing PlatformView. :)

I mean rendering at a refresh rate depending on the context of what is being rendered. See #90675 (comment) for more details.

@cyanglaz @iskakaushik Do you guys have further plans? :)

github-actions · 2023-03-05T08:01:49Z

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

Nico3652 mentioned this issue Jul 13, 2022

[iOS] ListView with UIKitView (NativeAds) Lags #103014

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maheshj01 added the in triage Presently being triaged by the triage team label Jul 13, 2022

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github-actions bot removed the waiting for customer response The Flutter team cannot make further progress on this issue until the original reporter responds label Jul 13, 2022

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github-actions bot removed the waiting for customer response The Flutter team cannot make further progress on this issue until the original reporter responds label Jul 14, 2022

maheshj01 changed the title ~~Platform-View (Native view) in List / Grid is unusable because of performance issues IOS / Android~~ Platform-View List / Grid scrolling is janky on IOS Jul 14, 2022

chinmaygarde added the P2 Important issues not at the top of the work list label Jul 18, 2022

Nico3652 changed the title ~~Platform-View List / Grid scrolling is janky on IOS~~ Platform-View List / Grid scrolling is janky on IOS / Android Jul 20, 2022

euphio mentioned this issue Jul 20, 2022

Android inline ad performance googleads/googleads-mobile-flutter#269

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huycozy mentioned this issue Oct 26, 2022

[IOS][platform_views] Scrolling a page containing platform views has noticeable jitter on Promotion devices #114010

Closed

cyanglaz mentioned this issue Nov 8, 2022

iOS PlatformView only sets a maskView when necessary flutter/engine#37434

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cyanglaz self-assigned this Nov 14, 2022

cyanglaz added P1 High-priority issues at the top of the work list and removed P2 Important issues not at the top of the work list labels Nov 14, 2022

auto-submit bot closed this as completed in flutter/engine#37434 Nov 18, 2022

0xZOne mentioned this issue Dec 7, 2022

[ios] Swiping a listview containing platform views has noticeable jitter on Promotion devices #116640

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Platform-View List / Grid scrolling is janky on IOS / Android #107486

Platform-View List / Grid scrolling is janky on IOS / Android #107486

Nico3652 commented Jul 12, 2022 •

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Nico3652 commented Jul 14, 2022 •

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github-actions bot commented Mar 5, 2023

Platform-View List / Grid scrolling is janky on IOS / Android #107486

Platform-View List / Grid scrolling is janky on IOS / Android #107486

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Nico3652 commented Jul 12, 2022 • edited Loading

b3nni97 commented Jul 13, 2022

euphio commented Jul 13, 2022

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Tom3652 commented Jul 19, 2022

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0xZOne commented Oct 26, 2022

0xZOne commented Oct 27, 2022 • edited Loading

iPhone 8

iPhone 13 Pro Max

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Nico3652 commented Jul 12, 2022 •

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