[wp-trac] [WordPress Trac] #64740: credentialless iframe incompatible with some browsers and cross-origin policies

[WordPress Trac]

#64740: credentialless iframe incompatible with some browsers and cross-origin
policies
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 Reporter:  amykamala     |       Owner:  adamsilverstein
     Type:  defect (bug)  |      Status:  reviewing
 Priority:  normal        |   Milestone:  7.0
Component:  Editor        |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by MadtownLems):

 I've been doing some timing of the Classic Editor, and while disabling
 client side media processing is clearly involved in the underlying issue,
 I found that Query Monitor being active makes the lag issue tremendously
 worse. More details here if interested or relevant:
 https://wordpress.org/support/topic/7-0-excessive-lag-when-loading-
 classic-editor/

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Ticket URL: <https://core.trac.wordpress.org/ticket/64740#comment:35>
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