Firefox 3 2008052304 (In reply to comment #122) > 1- How many of you have smooth scrolling on? Nope it's off. > 2- "dead slow", "horrible", "unbearable", etc.. are very subjective adjectives > which do not give any kind of accurate measurement 1 sec between redraws maybe > 3- How long is a long table or a very long table? "very long" is still vague 6 tables of 62 columns, 15 lines each, no backrgrounds on the cells. > 7- "'position: fixed;' is very important for top menu on intranets" 2 fixed divs > 4- How many of you are mentioning pages which have hundreds of validation errors > 5- lots of images, Flash-intensive, Flash-dependent, with a very large and deep > DOM tree of nodes with thousands of javascript lines of code spread > into several script files and functions, abusing setTimeout and setInterval, > with generated content (like ads rotating, iframe refreshed), in > over-constrained layout, over-excessively defined constraining stylesheets for > pixel-perfect layout, etc.? > 6- How many of you are mentioning webpages which would be considered - anyway > and regardless - CPU-demanding, RAM-demanding, video-memory-demanding and > user-system-resources demanding according to today's standards? How many of > those webpages are already pushing the limits a bit far to begin with? Yes that's the case. Maybe it should be slow then... regarding the mess in the code. After reading comment #122 this slow down could definitly be normal and justified. And a few people have probably been convinced that it's not a firefox problem. The code is a mess and is pretty heavy, there's a fixed div with a png background, and there a png background. It's slow. Without the images it's better but still slow. So I actually have 2 'bugs' here at the same time. But both of them have a big impact on performance. I'm posting this because Firefox 2 handles it perfectly fine. Like W. Brackets did, comment #124, rolling the scroll wheel as fast as possible, the time it took to scroll from top to bottom of the page, retried, 3 or 4 times if any difference: Smoothscroll on FF 2 about 5, 6 seconds, slightly slower than whithout smoothscrolling. FF 3 2008052304 took an astonishing 48 seconds the first time and 50 seconds the second time I tested it. Where 20 seconds are spent on the last 200px of the page. 8 times slower? We knew already that smoothscrolling did that, but I didn't really expect it to be this bad. Redrawn once per second as well, not worse then with smoothscroll off, but the distance scrolled at each redraw is a lot smaller. Smoothscroll off: Firefox/2.0.0.11 20071127: between 3 and 5 secondes, redrawing maybe 4 or 5 times a second. Firefox 3 2008052304 after trying several times: between 13 and 15sec to scroll from the top to the bottom, with about 1 redraw per second. About 3 times slower... But I don't really see shearing, a slight bit, but far less than some other websites on internet somethimes. I'm not using smoothscrolling anyway, I don't use it. This has been tested on a G5 1.8ghz 2gig ram, some nvidia card... I'm at work at the moment. But on Vista SP1 core 2 duo 7500, 2gig ram, 8400gt, the result is the same, it's faster but the differences between firefox 2 and 3 are still there. The website where I get this is on the intranet. There is a lot of private info on there, and the last attachment I posted has been stripped a bit too much too really see what happens on the intranet. The difference of speed between firefox 2 and 3 is not a visible as in the real case with the images but it's still there. I will try to upload a new archive containing the images/html/css files, stripped from the private information. I'll keep in touch.