[wp-trac] [WordPress Trac] #10021: Unresponsive script errors on widgets screen

[WordPress Trac]

#10021: Unresponsive script errors on widgets screen
-------------------------------------+--------------------------------------
 Reporter:  Denis-de-Bernardy        |        Owner:  azaozz  
     Type:  defect (bug)             |       Status:  reopened
 Priority:  high                     |    Milestone:  2.8.4   
Component:  JavaScript               |      Version:  2.8     
 Severity:  major                    |   Resolution:          
 Keywords:  has-patch needs-testing  |  
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Comment(by Denis-de-Bernardy):

 here's another interesting one... show() and :hidden are extremely slow on
 slow rendering engines, e.g. Opera 9 with a 400kb widgets page gets:

 {{{
 6ms -- $('#contextual-help-link-wrap')
 6071ms -- $('#contextual-help-link-wrap:hidden')
 }}}

 the next calls are very fast, until a new class gets added.

 similarly, adding an arbitrary ID to the page will render the next
 selector that users "#whatever" extremely slow in some engines...

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Ticket URL: <http://core.trac.wordpress.org/ticket/10021#comment:20>
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