Postgresql works too slow

Hello.

I'm trying to restore my database from dump in several parrallel processes, but restore process works too slow.
Number of rows about 100 000 000,
RAM: 8192M
CPU: Ultra Sparc 3
Number of CPU: 4
OS: SunOS sun 5.8
RDBMS: PostgreSQL 8.0

==================== prstat info ====================

PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
14231 postgres 41M 37M sleep 58 0 0:00.01 0.2% postgres/1
14136 postgres 41M 37M sleep 58 0 0:00.03 0.2% postgres/1
14211 postgres 41M 37M sleep 58 0 0:00.01 0.2% postgres/1
14270 postgres 41M 37M sleep 58 0 0:00.00 0.2% postgres/1
13767 postgres 41M 37M sleep 58 0 0:00.18 0.2% postgres/1
13684 postgres 41M 36M sleep 58 0 0:00.14 0.2% postgres/1

NPROC USERNAME SIZE RSS MEMORY TIME CPU
74 root 272M 191M 2.3% 0:26.29 24%
124 postgres 1520M 1306M 16% 0:03.05 5.0%

How to encrease postgresql speed? Why postgres took only 5.0% of CPU time?

Nurlan Mukhanov