[wp-trac] [WordPress Trac] #28580: Speed up customizer by lazy-loading controls and settings as needed

[WordPress Trac]

#28580: Speed up customizer by lazy-loading controls and settings as needed
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 Reporter:  westonruter  |       Owner:  westonruter
     Type:  enhancement  |      Status:  accepted
 Priority:  normal       |   Milestone:  4.4
Component:  Customize    |     Version:  3.4
 Severity:  normal       |  Resolution:
 Keywords:  needs-patch  |     Focuses:  javascript
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Comment (by westonruter):

 For nav menu items and widget instances, it's possible that we could
 postpone the fetching of the settings data until they are actually used.
 When a nav menu section or widget area (sidebar) section is expanded into
 view, this could kick off an Ajax request to load the settings data for
 the given menu items and widget instances. The request for widgets would
 also need to fetch the markup for each of the controls, since widgets
 still rely on PHP for all validation and form generation. (Aside, I'm
 proposing in #33507 a new implementation of widget controls that rely
 entirely on JS for form generation and data validation in the UI.)

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Ticket URL: <https://core.trac.wordpress.org/ticket/28580#comment:21>
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