Tested using Linux 2001121921/0.9.7+ on a dual p2-400. The image at the url above makes the browser very sluggish, so that any action that involves the image/window that image is loaded will respond very slowly. To reproduce: Drag another window in front of the image (using opaque move). The window will jerk instead of moving fluidly. -or- Load the image and resize the window so that you can scroll up and down. Scroll up and down using slider bar. Scrolling will not be fluid as it should be. One side effect of this bug is that pages with this image, namely: http://www.evil3d.net/news/ will cause the browser to become unresponsive while the page is being loaded. By scrolling on the news url, I was able to reproduce the bug on a P4 1.5 GHz WinXP machine. Viewing the image by itself does not cause a noticeable performance problem.
If it's definitely the GIF image causing the slowdown, then it sounds like bug 99636 (or some related bug). However, on my system, the slowdown only seems to occur when scrolling, I'm guessing this is actually a layout bug, possibly to do with tables? Or tables with images?
I am fairly sure this is an image problem only. I loaded the page with images disabled and it performs just fine. As I mentioned, the problem is really acute on Linux - testing on WinMe I don't notice any problems, even scrolling the whole page. The reason you are only seeing the problem with the full page is probably because the image occupies more screen space in that case so it takes more time to compute the scrolling. This is not a dupe of 99636 because it is not an animated gif and after the image is loaded cpu usage is at 0%.
wfm moz 0.9.8 win2k, anyone else verify with a newer build ?
WFM on WinMe, but not under Linux. Changing OS -> Linux, updating summary to reflect platform. Changing link to a simpler testcase.
the URL is gone. this problem is most likely related to the other bugs filed on browser sluginess with GIFs. is there any point of keeping this bug open?
This seems to be a lot better than it was previously. The browser no longer locks up as I try and scroll the image, but http://www.evil3d.net/news/ still feels quite sluggish scrolling up and down with the slider bar (K6-3 400, linux). A lot slower than a typical fullscreen image on digitalblasphemy, for example. http://www.xsta.cc/mozilla/mesh.html is the updated testcase link. A cursory search doesn't show any gif-related bugs that this seems to be a dupe of. So I'd like to keep it open until we can attach it to another bug.
Hampton: can you still reproduce it on 1.0RC1? it's even very fast for me on a Cel. 433 lap with 0.9.9/Linux.
WFM in 1.0RC1 on KDE 2.2.2, X-Server 4.2.0. Scrolls just fine... smoothly and responsively. Machine: AMD 450 MHz, 256MB RAM
Scrolling http://www.evil3d.net/news/ may still be a problem. I tried RC1 on my K6-3 machine and I was still having problems with that page. With a 1.5 GHz processor, it works fine. I will test again tomorrow, just to make sure. It could be a profile issue.
This is much better with RC1, even on the slower machine. I no longer see a noticeable delay when switching tabs and scrolling the evil3d.net page is considerably smoother (although not perfect). Fine with me if we resolve this bug now.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 16 years ago
Resolution: --- → FIXED
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