[wp-trac] [WordPress Trac] #6464: convert_smilies is very slow

[WordPress Trac]

#6464: convert_smilies is very slow
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 Reporter:  Acci          |       Owner:  anonymous
     Type:  defect        |      Status:  new      
 Priority:  normal        |   Milestone:  2.7      
Component:  Optimization  |     Version:           
 Severity:  normal        |    Keywords:           
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 I created a testing WordPress blog with 10 posts and I found huge
 performance problem in `convert_smilies` function. This function took at
 average 39 ms on my high-end PC.

 Currently this function uses `preg_replace` and it's called 40× for each
 part of the post.

 My solution is to use very similar function `preg_replace_callback` with
 modified regular expression. This solution is 6× faster than original (5,9
 ms).

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Ticket URL: <http://trac.wordpress.org/ticket/6464>
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