[wp-trac] [WordPress Trac] #45068: Specific CSS attribute slows down customizer panels on Chrome and Opera

[WordPress Trac]

#45068: Specific CSS attribute slows down customizer panels on Chrome and Opera
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 Reporter:  Themezly           |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Customize          |     Version:  4.9.8
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
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Comment (by Themezly):

 @mukesh27 class is not present in WP, this is related to anyone's custom
 CSS that is included in the page itself.
 This is not individual support but it is more likely browser related than
 WP but it affects WP very much so. There were numerous reports of users
 complaining about the panels speed and how on Firefox customizer is
 faster. This little nugget plays huge role on rendering in Chrome. You can
 close the issue if you like but users shouyld be avare of possible
 performance issues if  .class [ANYTHING] is used within their CSS.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45068#comment:2>
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