How to Determine Cause of Slow DC/GC Performance?

[Steve]

I've got 3 DC/GC in my single domain AD forest. All are located on my
LAN which consists of approx. 75 workstations. I've also got a WAN of
10 locations over T1 or DSL with approx. 200 workstations which these
boxes service.

1 DC is a PIII 600 with 512MB RAM and it is also the DHCP server, DNS,
WINS server and it also hosts the primary FSMO roles (IM, PDCE, etc).
The 2nd DC is the same HW, but also hosts NAV sig files for the
domain. The 3rd DC is a PIII 1GHz with 512MB RAM which also has RAS
services.

The issue is that the DC with the primary FSMO roles is very speedy.
If I'm in AD users and computers, properties for objects come up very
quickly...2-3 seconds. The other 2 DC's are quite slow..the one with
NAV sigs on it can take up to 30 secs to show object properties if I
switch to it from AD users and computers. The 3rd DC can take approx.
15 seconds.

How can I determine why this is?

Thanks.

Steve.

 

[Paul Bergson]

You could try dcdiag and netdiag full verbose and see if there is any type
of errors. This might help.