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 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
