[Webkit-unassigned] [Bug 180979] Web Inspector: Slow Load Time When Connected To Specific iCloud Account

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180979

Joseph Pecoraro <joepeck at webkit.org> changed:

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                 CC|                            |joepeck at webkit.org

--- Comment #1 from Joseph Pecoraro <joepeck at webkit.org> ---
Nothing in Web Inspector is tied to an iCloud account. However if you feel this really is related to your iCloud account I would recommend filing a bug report with Apple <https://bugreport.apple.com> (starting in a Safari component would be fine, include the video you included here as a `sudo sysdiagnose` to gather any relevant logs.

The video shows that Web Inspector itself loads slowly (you selected Inspect Element, and Safari showed Web Inspector on the Console tab quickly but took multiple seconds to actually switch to the Elements tab and be usable). This seems to be some kind of performance issue. It could even be another process hogging CPU time.

If you can readily reproduce this issue, try to run a `sudo spindump` immediately after opening Web Inspector. That would give a little information about what the entire system is doing, and if another process is consuming CPU time / inspector process is getting no CPU time.

If you do file a radar (which I recommend as the best path forward), please add a comment here with the bug number (the radar number) so I can view it. You can then upload attachments like the sysdiagnose / spindump to the radar to keep them private.

---

As a potential workaround you can try starting Web Inspector with no settings at all.

Note these steps are specific to the system Safari, not Safari Technology Preview.

  1. Quit Safari
  2. Move aside local settings into a temporary directory so it starts fresh
  $ mkdir -p ~/Desktop/temp
  $ mv ~/Library/WebKit/com.apple.Safari/WebsiteData/LocalStorage/file__0.localstorage* ~/Desktop/temp
  3. Restart Safari
    => See if the issue reproduces

If you want to restore your web inspector / file local settings you can move them back:

  1. Quit Safari
  2. Move files back (replacing the new ones that might have just been created)
  $ mv ~/Desktop/temp/file__0.localstorage* ~/Library/WebKit/com.apple.Safari/WebsiteData/LocalStorage
  3. Restart Safari
    => Should have your Web Inspector settings back

If it turns out that these settings were causing the problem it would be great if you could attach the file__0.localstorage to the radar so that we can investigate how those would affect performance here.

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