[wp-trac] [WordPress Trac] #32597: mediaelement.js high CPU usage in Firefox

[WordPress Trac]

#32597: mediaelement.js high CPU usage in Firefox
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 Reporter:  afercia       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Noticed by @iseulde, see discussion here:
 https://wordpress.slack.com/archives/core-editor/p1433862939000659

 Also reproduced on my (very old) machine that makes things very evident.
 Looks like mediaelement.js audio uses a linear gradient animation on the
 `mejs-time-buffering` element which triggers a Firefox bug. I remember
 similiar issues in Firefox reported years ago and probably never fully
 fixed. Should probably be reported upstream. See screenshot:

 [[Image(https://cldup.com/tAifYTyqQw.png)]]

 Removing that element from the DOM makes the CPU usage go down to 0.

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Ticket URL: <https://core.trac.wordpress.org/ticket/32597>
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