[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:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Future Release
Component:  Customize    |     Version:  3.4
 Severity:  normal       |  Resolution:
 Keywords:  has-patch    |     Focuses:  javascript
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Changes (by westonruter):

 * keywords:  needs-patch => has-patch


Comment:

 Currently the Customizer posts all settings with every request to the
 Preview, and this can add a lot of time with each request if there are a
 lot of settings registered (e.g. when there are a lot of sidebars
 registered).

 In [attachment:28580.diff] I've greatly improved the performance for
 loading the preview, including the delay for refreshing the preview, by
 changing the Ajax request to only include data for settings that have
 actually been changed (those which are dirty).

 (I think the `_dirty` property should be changed to perhaps be a `dirty`
 `Value` which can be watched itself.)

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Ticket URL: <https://core.trac.wordpress.org/ticket/28580#comment:4>
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