id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
8957,"100% CPU, unresponsive javascript when leaving admin ""Edit Posts"" and ""Edit Post"" pages",_timk,azaozz,"I'm experiencing javascript timeouts and high CPU usage when transitioning between ""Edit Posts"" and ""Edit Post"" pages in my WordPress admin interface.  

From the post list, when I click an edit link or a link to the next page of posts, Firefox shoots to 100% CPU usage for 5-8 seconds, usually shows the ""Unresponsive Script"" warning box, and then finally loads the next page.  The same happens transitioning from an Edit Post page back to the post list, or reloading the post list page.

If I disable javascript in my browser, the problem goes away.

I think this is related to the number of categories I'm using--I have a couple thousand.  The behavior makes me think something client-side is processing that category list on page unload, causing the delay.  I realize this is probably a corner case, but I think the admin UI should be able to scale.

I'm a web developer.  If someone has an idea on where to look, I may be able to help trace the problem.  I'm just not sure where to begin.",defect (bug),closed,normal,2.8,JavaScript,2.7,major,fixed,,