[Webkit-unassigned] [Bug 230973] New: Using device pixel ratio degrades performance on Safari iOS 15

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230973

            Bug ID: 230973
           Summary: Using device pixel ratio degrades performance on
                    Safari iOS 15
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tjkoury at gmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

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).

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