[wp-trac] [WordPress Trac] #54289: Improve get_shortcode_regex performance

[WordPress Trac]

#54289: Improve get_shortcode_regex performance
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 Reporter:  Antek88      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Shortcodes   |    Version:  trunk
 Severity:  normal       |   Keywords:  has-patch
  Focuses:  performance  |
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 Hi,

 It's my first PR to WordPress, I hope it goes well :).

 I ran Blackfire on my homepage (eCommerce shop with Woocommerce plugin).
 After analyzing it, I see that many shortcodes are parsing, but I don't
 use it directly. After some investigation, I see that in
 `get_shortcode_regex` is many unnecessary call implode/array_map function
 for empty `$tagsname` argument.
 After this patch, page response time is reduced by almost ~200ms.
 Blackfire profile screen:
 [[Image(https://monosnap.com/file/Vq4pXvVggX2AdEG4736sl0cShQNBbk)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/54289>
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