[wp-trac] [WordPress Trac] #33322: Theme Installer: spinner animated GIF and high CPU usage

[WordPress Trac]

#33322: Theme Installer: spinner animated GIF and high CPU usage
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 Reporter:  afercia       |       Owner:  wonderboymusic
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  4.4
Component:  Themes        |     Version:  4.2
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:  ui, javascript
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Comment (by afercia):

 There's one more thing to consider: the CPU usage '''while''' the spinner
 is being displayed. As per the testing run on #33311 applying an animated
 GIF as background on a so large area forces browsers to continuously
 repaint the whole area. For example, here's what Chrome does. The console
 "Enable paint flashing" option will allow you to actually see the re-
 painted area. There's a similar option in Firefox's console.
 To minimize the high CPU usage, the spinner should be used as background
 of the smallest possible area (20px x 20px) as experimented on #33311
 using CSS generated content.

 [[Image(https://cldup.com/0G29noiXD6.png)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/33322#comment:10>
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