5.1 and nawk

Tonight I'v installed a devel/newfile. When it's build it run nawk. In 
that time my computer was a very slow reaction without disk operation. 
When I'v runned top command I'v seen:
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last pid: 38039;  load averages:  1.58,  1.80,  1.73    up 0+01:21:08 
05:22:28
53 processes:  3 running, 50 sleeping
CPU states: 98.2% user,  0.0% nice,  1.3% system,  0.5% interrupt,  0.0% 
idle
Mem: 27M Active, 52M Inact, 25M Wired, 6820K Cache, 22M Buf, 13M Free
Swap: 237M Total, 160M Used, 77M Free, 67% Inuse

   PID USERNAME PRI NICE   SIZE    RES STATE    TIME   WCPU    CPU COMMAND
38037 root     124    0  1456K   788K RUN      4:17 1874.03% 1185.45% nawk
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1874% CPU load? What's that?

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Sem.