NEW 255597
Jank / lag with scroll linked WebGL animations. 
https://bugs.webkit.org/show_bug.cgi?id=255597
Summary Jank / lag with scroll linked WebGL animations.
supermoos
Reported 2023-04-18 06:24:38 PDT
Created attachment 465962 [details] iphone_14_pro_ios_16_4_1_recorded with another phone_laggy_jank-1 Somewhere between iOS 15.3.1 and 16+ scroll linked animations in WebGL became laggy / janky. This demo should easily run 60 fps on an iPhone 14 Pro, however it's not able to. Weirdly the issue goes away if screenrecording the issue, therefor I've attached multiple videos. Both screenrecording and another phone recording the iPhone 14 Pro. An iPhone SE running 15.3.1 does not exhibit this issue. Is it perhaps ProMotion related?
Attachments
iphone_14_pro_ios_16_4_1_recorded with another phone_laggy_jank-1 (44.35 MB, video/quicktime)
2023-04-18 06:24 PDT, supermoos 		no flags
Details
iphone_se_ios_15_3_1_60fps (2.20 MB, video/mp4)
2023-04-18 06:25 PDT, supermoos 		no flags
Details
iphone_14_pro_ios_16_4_1_screenrecording_60fps (5.00 MB, video/mp4)
2023-04-18 06:25 PDT, supermoos 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
supermoos
Comment 1 2023-04-18 06:25:06 PDT
Demo link: https://hellofunday.com/clients/webkit_bug_scroll/?600
supermoos
Comment 2 2023-04-18 06:25:32 PDT
Created attachment 465963 [details] iphone_se_ios_15_3_1_60fps
supermoos
Comment 3 2023-04-18 06:25:51 PDT
Created attachment 465964 [details] iphone_14_pro_ios_16_4_1_screenrecording_60fps
Radar WebKit Bug Importer
Comment 4 2023-04-18 09:38:29 PDT
<rdar://problem/108205349>
Kimmo Kinnunen
Comment 5 2023-04-20 10:49:08 PDT
Thank you for the report. I can reproduce the issue.
supermoos
Comment 6 2023-10-13 05:16:33 PDT
Is there any updates on this bug? It's still present on an iPhone 15 Pro running ios 17.03.
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