[Webkit-unassigned] [Bug 231655] New: Web Inspector: Reproducible hangs on twitter.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231655

            Bug ID: 231655
           Summary: Web Inspector: Reproducible hangs on twitter.com
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com
                CC: inspector-bugzilla-changes at group.apple.com

Created attachment 441033

  --> https://bugs.webkit.org/attachment.cgi?id=441033&action=review

Sample of Safari Web Inspector process

Steps to reproduce:
1) Open a private Safari window
2) Open https://twitter.com/jack
3) Open the web inspector
4) Select the Elements tab
5) Scroll down the Twitter page

This bug occurs reproducibly with both Safari Version 15.0 (16612.1.29.41.4, 16612) and Safari Technology Preview Release 133 (Safari 15.4, WebKit 16613.1.2.2) on macOS Version 11.6 (20G165).

Attached are samples of the hangs. I'm also seeing the web inspector process at >100% CPU in Activity Monitor.

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