I am using Slony with 4 slaves, and I look that my CPU in master has with
25% - 40 % busy when slony is active (UP). When I stop Slony the CPU is less
than 8% busy in Master.
 I will need to use 80 slaves in 2 months, then I am nervous with this.

 Is this normal? Is there something that I could do to my CPU stay with
lower?

 My master is CPU Intel Pentium 4 (3.20GHz) with 1 Gb RAM.
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