[Webkit-unassigned] [Bug 158335] New: HTMLMediaElement.prototype.canPlayType accounting for 250-750ms first loading theverge.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158335

            Bug ID: 158335
           Summary: HTMLMediaElement.prototype.canPlayType accounting for
                    250-750ms first loading theverge.com
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: akling at apple.com, eric.carlson at apple.com,
                    jer.noble at apple.com, jonlee at apple.com,
                    koivisto at iki.fi, webkit-bug-importer at group.apple.com

Created attachment 280402
  --> https://bugs.webkit.org/attachment.cgi?id=280402&action=review
[IMAGE] Web Inspector Profile - 750ms in canPlayType

* SUMMARY
HTMLMediaElement.prototype.canPlayType accounting for 250-750ms first loading theverge.com.

See attached screenshot. With the steps to reproduce below I saw 250ms and 750ms spent in canPlayType for the first page load in a WebContentProcess.

* STEPS TO REPRODUCE
1. Open about:blank
2. Open Web Inspector
3. Show Timeline Tab
4. Enable Script & Events Timeline
5. Navigate the page to <http://www.theverge.com>
6. Let timeline auto-record and stop recording
7. Show Script & Events Timeline, Call Trees, Bottom Up View
  => Many milliseconds were spent inside of HTMLMediaElement.prototype.canPlayType

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