Performance killer on my Natty 64-bit install

[Ralf Mardorf]

spinymouse at natty:~$ top

top - 18:52:37 up 3 min,  2 users,  load average: 0.83, 0.63, 0.26
Tasks: 193 total,   1 running, 191 sleeping,   0 stopped,   1 zombie
Cpu(s): 80.3%us,  8.9%sy,  0.0%ni, 10.8%id,  0.0%wa,  0.0%hi,  0.0%si,
0.0%st
Mem:   3919872k total,   996548k used,  2923324k free,    81016k buffers
Swap:        0k total,        0k used,        0k free,   353656k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+
COMMAND                                                                          
1092 syslog    20   0  179m 5512 1048 S  177  0.1   4:48.06
rsyslogd                                                                         
1295 root      20   0  446m  64m  15m S    1  1.7   0:10.25
Xorg                                                                             
   19 root     -50   0     0    0    0 S    0  0.0   0:00.28
sirq-timer/1                                                                     
2162 spinymou  20   0  364m  19m  14m S    0  0.5   0:00.49
gnome-terminal                                                                   
2267 spinymou  20   0 19408 1472 1040 R    0  0.0   0:00.25 top

Even if I switch the CPU frequency scaling to ondemand the CPU is
running full throttle . 1 zombie, 2 users?

On Ubuntu Maverick 32-bit I can run a 'hard' audio/MIDI session and
hardly reach a load of 80% ;).