Slow page rendering with Firefox

[Marius Andreiana]

On Sat, 2005-08-20 at 20:10 -0400, Raman Gupta wrote:
> The firefox on my fully updated Fedora Core 4 box renders many larger
> pages very slowly. During the page rendering, Firefox "hangs"
> completely. A good test page is:
> 
> http://scragz.com/tech/mozilla/test-rendering-time.php
Thanks for the analysis. I've got 68 seconds on FC4 updated.

Would you please file a bug about it on bugzilla.redhat.com and let us
know the bug number?

Is somebody able to test this with firefox 1.5 in fedora development?
I'm CCing fedora-test.


> Rendering the scragz page, and others, on the same hardware and OS,
> various other browsers are over 4 times faster, including Firefox for
> windows:
> 
> Linux Firefox 1.06                  42.23
> Linux Konqueror 3.4.2-0.fc4.1       13.27
> Linux Opera 8.02 build 1272          7.08
> Windows (via VMWare) Firefox 1.06    8.18
> Windows (via VMWare) IE 6            7.12
> 
> All of the above times are without any extensions *or* plugins installed
> (in fact, with Greasemonkey installed, Linux Firefox took over 100
> seconds to render).
> 
> Running an strace on the Firefox process while loading occurred shows a
> lot of time being spent in brk() calls (usually one brk call was over
> 20s). Here is output from "vmstat 5" while the page rendering is occurring:
> 
> procs -----------memory---------- -swap- ---io--- --system-- ----cpu----
>  r  b   swpd   free   buff  cache  si so  bi   bo   in    cs us sy id wa
>  [...]
>  0  0 620600  76896   7292 432368  0  0   1     4 2212  4947  7  5 88  0
>  1  0 620600  76896   7316 432372  0  0   0    18 2213  4963  9  6 85  0
>  [page load starts]
>  5  0 620600  76772   7348 432624  0  0   6    66 2282  4882 64 10 25  1
>  1  0 620600  76672   7364 432640  0  0   1     6 2205  4909 94  6  0  0
>  3  0 620600  76648   7388 432652  0  0   2    20 2228  4943 92  7  0  0
>  1  0 620600  76416   7412 432668  0  0   1    67 2217  4910 94  6  0  0
>  2  0 620600  76408   7428 432684  0  0   1    18 2224  4889 93  7  0  0
>  2  0 620600  76276   7436 432696  0  0   1     2 2210  4889 93  7  0  0
>  1  0 620596  76260   7452 432712  1  0   2    18 2213  4871 91  9  0  0
>  1  0 620596  76292   7468 432728  0  0   1    11 2213  4868 90 10  0  0
>  [page load ends]
>  3  0 620596  75384   7524 432756  0  0   6    26 2258  5537 69 12 19  0
>  0  0 620596  75308   7540 432768  0  0   1    14 2215  4885 16  7 77  0
>  0  0 620596  75144   7680 432840  0  0  12   161 2232  4957 10  8 81  1
>  0  0 620596  75176   7696 432856  0  0   1    50 2213  4926  7  6 87  0
> 
> So swapping is not an issue. Lots of memory is available if cache is
> included. Not much disk activity is happening, but the CPU is getting
> hammered.
> 
> This was also tested using a completely new profile (no ~/.mozilla
> directory present), with the same result.
> 
> Can anyone else duplicate these results?  Does anybody have any other
> debugging/setup/configuration suggestions?
> 
> Cheers,
> Raman Gupta
> 
-- 
Marius Andreiana