From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0rc3) Gecko/20020523 BuildID: 2002052306 When loading up certain websites, or when these websites are loaded in Mozilla it causes serious system lags and temporary freezing. Appears to be some sort of severe rendering problem or memory leaks. Reproducible: Always Steps to Reproduce: 1. Load up one of the following URL's, which all contain a slightly different layout of the code, some with Javascript, some without. http://www.pixelcarve.com/test/index.html http://www.pixelcarve.com/test/index1.html http://www.dynotion.com/ http://www.dynotion.com/index1.html 2. The system will freeze temporarily during loading, and in the case of http://www.pixelcarve.com/test/index.html and http://www.pixelcarve.com/test/index1.html it will freeze temporarily when using the drop down menus. For all of these sites the browser will also freeze temporarily when it's maximized after being minimized, being brought to focus, and when other applications (like Notepad) are closed when sitting on top of the open Mozilla window. Actual Results: System has serious performance problems, with both the mouse and display freezing temporarily. Expected Results: Should have reacted the same way it does in IE and Netscape 4, quick loading with no mouse or display freezes. I can't figure out what's causing this. I seem to run into this issue designing a lot of sites, but for the life of me I can't figure out what I'm doing to cause it. For the most part these are just simple table designs using Dreamweaver with minor tweaking. Using a DOCTYPE declaration doesn't seem to have an effect on the system freezing, although on some pages not using one can cause Mozilla to keep trying to transfer data from the server even if the site has fully loaded. If it is something I'm doing that's causing it I'd really like to know about it so I can work around it, since my sites all seem to work great in NS4 and IE and there doesn’t seem to be any rhyme or reason for this to be happening in Mozilla, since I can't see the difference between websites I make that do have this problem and ones that don't. Since Dreamweaver is pretty common, as is this very structured way of website design, I doubt I’m the only person experiencing this and fear it could be a Mozilla 1.0 showstopper if it’s not fixed. It should also be noted these problems occur when the pages are loaded locally on my machine as well, so it’s not server related.

wfm 2002052523 on linux..

WFM with 2002051006 on Win2k on Athlon600. The first pixelcarve page uses high CPU on load, but no longer than a quarter of a second or less. Still not a bug, in my impression. And certainly not a critical one.

Using 2002052809/trunk/W2K for first time was testcase's menus slow, but after some activity is reaction time of menus common.

WFM 2002052008 intel celeron 600

seeing the slowliness with build 2002052809 on Win2k (trunk). This should be dupe of bug 143046 (by way of bug 143219), because of the GIF background image being 20x2000 pixels.

In bug 141786 I came up with a one line fix that takes care of this. I checked the website in this bug.. and it really speeds things up at least anything having to do with background scrolling. Marking this bug a duplicate of that.. and you can recheck when I get that fix into the trunk. *** This bug has been marked as a duplicate of 141786 ***

Ahhhhh... the transparent gif background image... BINGO! That's definitely what's causing the problem. Removing it speeds Mozilla right back up, and in the case of http://www.pixelcarve.com/test/index.html there is a transparent gif behind the drop down menus (to combat and Netscape 4 table bug), which would explain why those menus are so slow in Mozilla. I surmise I'm probably not the only one using transparent gifs are background images or table backgrounds so it's good to know there is a fix in the works for the next release, as this would be a major problem if it made it into the final 1.0.