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

WordPress Trac noreply at wordpress.org
Tue Jun 9 15:37:09 UTC 2015

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

 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:


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

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