Xorg memory usage

[Claudio Miranda]

    I installed KUbuntu (6.06), and I am seeing very high memory consumption by
Xorg process, see (excerpt from 'top' command)

Tasks:  96 total,   2 running,  94 sleeping,   0 stopped,   0 zombie
Cpu0  : 14.3% us,  0.0% sy,  0.0% ni, 85.7% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu1  :  0.0% us,  7.1% sy,  0.0% ni, 92.9% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   1544688k total,  1159064k used,   385624k free,    30836k buffers
Swap:  1630588k total,        0k used,  1630588k free,   544784k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 4769 root      15   0  493m 230m  11m S    4 15.3   2:50.84 /usr/bin/X -br
-nolisten tcp :0 vt7 -auth /var/run/xauth/A:0-Xn0F0u

    230 MB (res) is very high. So, is it normal ? How can I track down why X is
consuming that.

Tasks:  93 total,   1 running,  92 sleeping,   0 stopped,   0 zombie
Cpu0  :  0.0% us,  0.3% sy,  0.0% ni, 99.7% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu1  :  0.3% us,  0.0% sy,  0.0% ni, 99.7% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   1544672k total,   904120k used,   640552k free,    18496k buffers
Swap:  1630588k total,        0k used,  1630588k free,   284036k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 4751 root      15   0  572m 309m 7788 S    0 20.5   4:25.58 /usr/bin/X -br
-nolisten tcp :0 vt7 -auth /var/run/xauth/A:0-fSNeRq

    That one (above) was taken some minutes before sent this message. See the
309 MB memory usage.

    Last friday, I was using wink (debugmode.com) to edit a screened movie, then
the Xorg memory usage grows until 1,1 GB, that was unusable, I needed to restart
the machine.


my system: toshiba laptop S4014, 1,5 GB RAM, Intel 945 video board (shared
memory) using i810 Xorg driver. 

TIA

Claudio Miranda