Slow scrolling with Firefox -> maybe a XOrg problem?

[Hermann Himmelbauer]

Hi,
I am experiencing very slow scrolling with Mozilla/Firefox (both Mozilla and 
Firefox, all recent versions) on specific web sites. My System is SuSE 9.2 
with XOrg 6.8.1-15 and the nvidia driver "1.0-7174". My System is a Athlon XP 
1600+.

I am not sure if this is an Xorg or Firefox/Mozilla/Gecko issue, but to my 
mind XOrg is behaving strange.

On specific sites (also very simple ones, like this):

http://www.w3.org/TR/soap/

Scrolling is very, very slow. When scrolling and looking at "top", it  shows 
that the firefox binary is nearly idle but the process "X" is consuming the 
whole CPU time.:

Tasks:  92 total,   2 running,  90 sleeping,   0 stopped,   0 zombie
Cpu(s): 92.4% us,  1.0% sy,  0.0% ni,  0.0% id,  0.0% wa,  1.0% hi,  5.6% si
Mem:    775684k total,   647640k used,   128044k free,    19676k buffers
Swap:  1052248k total,    73332k used,   978916k free,   216932k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5815 root      25   0  619m 279m 332m R 95.6 36.9  12:55.04 X
 7132 dusty     15   0 75232  40m  42m S  2.3  5.3   0:10.70 firefox-bin

When shutting off the CSS-Stylesheet, the situation changes:

Tasks:  92 total,   1 running,  91 sleeping,   0 stopped,   0 zombie
Cpu(s): 86.0% us,  2.0% sy,  0.0% ni, 10.4% id,  0.0% wa,  1.3% hi,  0.3% si
Mem:    775684k total,   649228k used,   126456k free,    19968k buffers
Swap:  1052248k total,    73332k used,   978916k free,   216932k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5815 root      16   0  619m 281m 332m S 59.4 37.1  13:11.20 X
 7132 dusty     16   0 75668  40m  42m S 23.2  5.3   0:13.86 firefox-bin

X is consuming far less of the CPU and the scrolling is very fast.

I tried many things like enabling/disabling Firefox smooth scrolling, dropping 
all Firefox preferences and restarting it with it's default profile, using 
Firefox without a windowmanager (just start X11 and Firefox, no Window 
manager) and so on.

Do you have any clue?

Best Regards,
Hermann

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