Xorg mi arriva anche al 40% di utilizzo.... avrò sbagliato qualcosa nella configurazione?

Ecco un estratto di TOp:

codice:
top - 15:59:22 up  2:11,  2 users,  load average: 2.65, 2.41, 2.32
Tasks:  96 total,   5 running,  91 sleeping,   0 stopped,   0 zombie
Cpu(s): 76.4%us,  8.6%sy,  0.0%ni, 15.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   1547188k total,   635852k used,   911336k free,    28424k buffers
Swap:   979956k total,        0k used,   979956k free,   300948k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 6304 root      15   0  454m  87m  10m S 35.6  5.8   3:30.51 Xorg
 6583 piratabe  15   0  207m  91m  23m R 35.2  6.0   4:42.79 firefox-bin
 7061 piratabe  16   0 33244  13m 9648 R  7.6  0.9   0:01.25 gnome-terminal
 6403 piratabe  16   0  108m 5928 3864 R  2.7  0.4   0:32.04 beryl
 6394 piratabe  15   0 45928 8404 5428 R  1.0  0.5   0:14.10 xmms
 6460 piratabe  15   0 17612 7992 6776 S  0.7  0.5   0:02.95 geyes_applet2
 2773 haldaemo  15   0  5860 4320 1660 S  0.3  0.3   0:03.82 hald
 6419 piratabe  15   0 22908  11m 9680 S  0.3  0.8   0:02.76 wnck-applet
 7084 piratabe  15   0  2232 1132  856 R  0.3  0.1   0:00.25 top
    1 root      15   0  1944  648  552 S  0.0  0.0   0:00.94 init
    2 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/0
    3 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/0
    4 root      10  -5     0    0    0 S  0.0  0.0   0:00.51 events/0
    5 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 khelper
    6 root      13  -5     0    0    0 S  0.0  0.0   0:00.00 kthread
    9 root      10  -5     0    0    0 S  0.0  0.0   0:00.01 kblockd/0
   10 root      18  -5     0    0    0 S  0.0  0.0   0:00.99 kacpid