Bug 230973 - REGRESSION (iOS 15): Using device pixel ratio degrades performance (2x lower FPS than iOS 14)
Summary: REGRESSION (iOS 15): Using device pixel ratio degrades performance (2x lower ...
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebGL (show other bugs)
Version: Safari Technology Preview
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2021-09-29 11:53 PDT by tjkoury@gmail.com
Modified: 2022-04-11 22:38 PDT (History)
7 users (show)

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Description tjkoury@gmail.com 2021-09-29 11:53:49 PDT 
The Cesium library (https://cesium.com)performance is halved when using the devicePixelRatio for canvas resolution.

These app:

https://celestrak.com/cesium/orbit-viz.php?tle=/pub/TLE/catalog.txt&satcat=/pub/satcat.txt&referenceFrame=1


runs at 35fps on Chrome 93.0.4577.63 (64-bit), Pop!_OS 20.10 & Windows 10, iPhone 12 Pro Max (iOS 14), iPad 2020 (iOS 14).

Updated this morning on iPhone & iPad, immediate 50% reduction in performance (~17 fps).
Comment 1 Radar WebKit Bug Importer 2021-09-29 15:55:10 PDT 
<rdar://problem/83692664>
Comment 2 Kimmo Kinnunen 2021-10-13 00:30:24 PDT 
Thanks for the report. I can repro that the app is definitively smoother on iOS 14 than iOS 15.
Comment 3 tjkoury@gmail.com 2021-10-21 06:09:14 PDT 
Any additional information required?
Comment 4 Dan Glastonbury 2022-04-11 22:38:21 PDT 
Fixed in the ANGLE roll https://bugs.webkit.org/show_bug.cgi?id=238171