[Webkit-unassigned] [Bug 262097] New: REGRESSION (iOS 17): 100x performance degradation of Range.setStart() after repeating DOM operation.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262097

            Bug ID: 262097
           Summary: REGRESSION (iOS 17): 100x performance degradation of
                    Range.setStart() after repeating DOM operation.
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: baba at bpsinc.jp

Created attachment 467868

  --> https://bugs.webkit.org/attachment.cgi?id=467868&action=review

testcase

# Steps to reproduce

1. Open attached sample.html
2. Wait tens of seconds.

# Expected behavior

The processing time shown in "h1" tag is stable, about 20-100ms.

# Actual behavior

On iOS 17 Safari, the processing time is going to be about 10-100 times slower (about 1000-5000ms), after about 20 seconds.
The performance is good in first few seconds.

# Note

The sample repeats creating a range, modifying the DOM and revert them many times.
According to the inspector, "Range.setStart()" in "releaseRange()" takes long time.

The issue does not occur on iOS 16.2 and Safari Technology Preview 17.0 on macOS.

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