ISA Server slow! Perfmon Counters?

We are having issues with an ISA Server that constantly gives us issues during certain times of the day. Some users can get through the ISA and access the internet while others time out. When we take out our ISA Server properties in our web browser (bypass proxy) we can get to the sites just fine.

Our disk subsystem consists of 15k RPM drives and our URL cache is on a seperate partition. I ran the BPATool and found some things suspect however, they are not really things that would cause ISA to time out some users requests.
Any help is appreciated. Thanks a bunch everyone!

Our ISA is natted twice but this may be lifted temperarily for testing. The ISA is within our DMZ.

Can someone tell me what counters in perfmon to search on so I can get some trend analysis statistics?

I don't know what to search for so obviously I would see lots of false positives or so many counters that I would be overwhelmed with data.

Can anyone help?
snyderkvAsked:
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DawilliamsCommented:
Is this a new problem or has it ever worked?
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NicolasQuenardCommented:
What's the physical spec of your server? How many users have you got? did you check out the ISA capacity planner?
Is your gateway and DNS server configured correctly on the ISA server?

I generally use the counter "Web Proxy>Average Milliseconds/request" to identify slowness. If this counter is too high this mean the request are being delay.

Other method: run a network analyser and look for the time it take to ISA to answer the request of a client having slowness issue.

links:
capacity planner: http://www.microsoft.com/isaserver/capacityplanner.swf
perf counters: http://technet.microsoft.com/en-us/library/bb794879.aspx
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snyderkvAuthor Commented:
Thanks I will look at those counters. Can't see how it will help me fix anythhing though especially seeing how I don't know what is bad and what is good.
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