[wp-trac] [WordPress Trac] #63793: Parser-blocking scripts should render last in all cases to speed up page load

[WordPress Trac]

#63793: Parser-blocking scripts should render last in all cases to speed up page
load
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 Reporter:  kkmuffme       |       Owner:  (none)
     Type:  enhancement    |      Status:  new
 Priority:  normal         |   Milestone:  Future Release
Component:  Script Loader  |     Version:  2.1
 Severity:  normal         |  Resolution:
 Keywords:  has-patch      |     Focuses:  javascript, performance
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Comment (by kkmuffme):

 Thanks. Didn't read all your benchmarks, but:

 >Priority 1: Async scripts - Render first (non-blocking, parallel
 download)
 >Priority 2: Defer scripts - Render second (non-blocking, ordered
 execution)

 Swapping them around should actually be faster (as outlined in my OP),
 since an async script will execute as soon as it's downloaded blocking the
 thread.
 Since "defer" only executes at the end and isn't parser or render blocking
 up to that point.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63793#comment:12>
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