[Webkit-unassigned] [Bug 153634] New: Web Inspector: Background Tabs waste a lot of time on reload populating editor content

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153634

            Bug ID: 153634
           Summary: Web Inspector: Background Tabs waste a lot of time on
                    reload populating editor content
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                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 270177
  --> https://bugs.webkit.org/attachment.cgi?id=270177&action=review
[IMAGE] Profile of reloading page with inspector

* SUMMARY
Background Tabs waste a lot of time on reload populating editor content.

* STEPS TO REPRODUCE
1. Inspect webkit.org
2. Resources > select a resource
3. Debugger > select a different resource
4. Show Console Tab
5. Reload
  => ~300ms of frontend time (85%) is spent populating source code text editor content for the resources in the background tabs

* NOTES
- It may be fine for the background tabs to fetch the content, but not to process it!
- See attached screenshot for a profile

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