[Webkit-unassigned] [Bug 135313] New: Web Inspector: Timelines performance is very slow, has many forced layouts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135313

           Summary: Web Inspector: Timelines performance is very slow, has
                    many forced layouts
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: joepeck at webkit.org
                CC: timothy at apple.com, simon.fraser at apple.com,
                    joepeck at webkit.org,
                    webkit-bug-importer at group.apple.com,
                    graouts at webkit.org


* SUMMARY
Working with the Timelines panel there are a lot of performance issues. There are many forced layouts, multi-second hangs, and it can be unresponsive to user actions.

* STEPS TO REPRODUCE - 1
1. Inspect apple.com
2. Start a timeline recording
3. Focus the search field in the top right of the page
4. Type "test string"
  => everything is slow during the recording
5. Stop recording
6. Select the Script or Layout timeline
  => hangs for a very long time

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