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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-
> user-system-
> 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.