User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 Firefox 3.5 is not responding for about 60 seconds while rendering the page. The 3.0.x version renders this page in 1-2 sec. So v3.5 is 20-40 times slower, on this particular page. Speed is one problem, but the real problem is that the process is not responding to mouse and keyboard events. My Movies (all) page contains ~1600 titles. Rendering a page with ~700 titles takes "only" 10 seconds and the same not responding issue. See Mozilla Reporter: - RMO12472475245711 - RMO12462161785463 - RMO12464359507899 There were no problems when I made one of my categories with ~700 titles public, and opened the url without logon. The difference between the w and w/o logged on pages is that the Votes column is empty if the user is not logged on. I think maybe the rendering of the cells of the Votes column is the cause of the problem. I'm going to try to reproduce it while disabling all add-ons in safe mode. Reproducible: Always Steps to Reproduce: 1. Open an IMDb MyMovies page with more than 1000 titles, logged on (Votes column must not be empty) Actual Results: Browser hangs and is not responding to events (keyboard, mouse, ...) for minutes. Expected Results: Not freezing for minutes. I can provide the list of add-ons, if the hanging problem doesn't occur in safe-mode when all add-ons are disabled. I'm going to attach the saved page in zip format (MyMovies.htm and MyMovies_files folder).
The problem also occurs in Vista, see RMO12462161785463 - OS/CPU: Windows NT 6.0
The non respondig issue happens even if all add-ons are disabled in safe-mode
The difference between the w and w/l log in versions is that the Votes column contains ~1600 cells with fields like this: <input type="checkbox" name="e" value="79970368:0114924" >
This not responding and very bad performance issue only occurs if the user is logged in and the first column (not the Votes column) contains all the checkboxes. It seems that the root cause is the rendering of the more than 1500 <input type="checkbox" name="e" value="0000000:000000"> tags.