[wp-trac] [WordPress Trac] #17177: Optimize parse_request for the home page (empty request)

[WordPress Trac]

#17177: Optimize parse_request for the home page (empty request)
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 Reporter:  duck_         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Performance   |    Version:
 Severity:  normal        |   Keywords:  has-patch
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 When you visit a site's home page the request (WP::$request) is empty.
 However we still try to match it against every rewrite rule. By default
 none of the rules will match. This can be particularly bad when verbose
 page rules are enabled and WordPress is attempting 700+ regex matches (~50
 pages) or more for especially large page oriented sites on an empty
 string.

 The only reason against breaking from the loop like we do for wp-app.php
 in this case I could think of is if a plugin has added an extra rule to
 match `^$`.![1] If we want to allow this then maybe manually check for a
 rule == `$` and still break early.

 ![1] This can currently be blocked by #17176 as `()(/[0-9]+)?/?$` matches
 an empty string

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Ticket URL: <http://core.trac.wordpress.org/ticket/17177>
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