[Webkit-unassigned] [Bug 247718] New: getClientRects is extremely slow on certain condition

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Nov 10 00:21:33 PST 2022


https://bugs.webkit.org/show_bug.cgi?id=247718

            Bug ID: 247718
           Summary: getClientRects is extremely slow on certain condition
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: skoji at skoji.jp

HTML to reproduce the bug; https://skoji.jp/get-client-rects-extremely-slow.html

getClientRects is extremeley slow with this sambple on iPad OS 16.1 compared to iPadOS 13.7 or iPadOS 14.5.

The result of sample above:

* (Simulator) iPad Pro (12.9-inch 4th gen)/ iPadOS 13.7 : 541 msec
* (Simulator) iPad Pro (12.9-inch 5th gen)/ iPadOS 14.5 : 1629 msec
* (Simulator) iPad Pro (12.9-inch 5th gen)/ iPadOS 16.1 : 46384 msec
* iPad 7th generation / iPadOS 15.5                     : 25274 msec
* iPad Pro (11-inch) 2nd generation                     : 17811 msec

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