[Webkit-unassigned] [Bug 156250] New: Web Inspector: DOM updates slow when switching between inspector tabs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156250

            Bug ID: 156250
           Summary: Web Inspector: DOM updates slow when switching between
                    inspector tabs
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jamie at jgwhite.co.uk
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

Created attachment 275695
  --> https://bugs.webkit.org/attachment.cgi?id=275695&action=review
Simple test page

Steps to reproduce:

1. Load the test page
2. Click "Start"
3. Open the inspector with alt+cmd+i (should open on elements tab with body closed)
4. Note ms/frame (~10 on my early 2015 MacBook Air)
5. Switch to console tab
6. Note ms/frame increases (~40 on my machine)

To be clear: I expect some slow down when the elements tab is open, but only modest slow down when the console tab is open.

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