445397 - Working with xul list boxes with many elements is extremely slow. Mouse clicks and keyboard navigation anywhere on the page, as well as in the listbox itself, become extremely slow.

Status: RESOLVED INCOMPLETE

(Firefox :: General, defect)

Description

[Rich Caloggero]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.2pre) Gecko/2008071506 GranParadiso/3.0.2pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.2pre) Gecko/2008071506 GranParadiso/3.0.2pre

When viewing a xul document containing a listbox with a large number of elements in it (more than 100 - test case uses 1400), firefox responds very slowly to all input events: mouse clicks and key presses. It is most apparent when trying to select from the list: an arrow key press or mouse click takes almost 10 seconds on hardware.  Tabbing among elements on the page is also slowed to a crawl.
 modern 

Reproducible: Always

Steps to Reproduce:
1. open the attached test case

2. 
answer ok to the two alerts

3. click on the list and try to select an item with keyboard or mouse

Actual Results:  
All interactions with the document slow to a crawl.


Expected Results:  
Not be so slow about it.

Comment 1

[Rich Caloggero]

Cannot add test case - keeps telling me that I did not supply a filename, even though it shows up in the box.
Use the following URL:
http://narita.mit.edu/ncam/firefox/xul/list.xul

Comment 2

[szklarczyk]

This looks like a duplicate of Bug 477564

Comment 3

[Wayne Mery (:wsmwk)]

Rich, still see this issue in 3.6?

Comment 4

[Tyler Downer [He/Him]]

No reply, INCOMPLETE. Please retest with Firefox 3.6.x or later and a new profile (http://support.mozilla.com/kb/Managing+profiles). If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.