10.6 server Combo update causes WGM respond slowly any fixes?

A common trigger for slowness in the Server Admin tools is a DNS server or DNS configuration error. To test for that, launch Terminal.app (Applications > Utilities) and issue the following (non-destructive, informational-only, no changes performed) command:

sudo changeip -checkhostname

enter an administrative password when prompted, and then read through the output, and (down near the bottom) whether it reports changes required, or if no changes are required.

have a look at activity monitor see if any of the running processes are causing high CPU usage