OWA slowness

I have a Exchange 2007 environment we are about to put into production to replace a Exchange 2003 system. The new system is using two apache 2.2 reverse-proxy servers in our DMZ running CentOs 5.5. The reverse-proxy boxes are behind a Cisco load balancer.

I have had to use a self-signed cert for the testing, we did get a Verisign cert for the production hostname, but we did not want to spend the money w/ Verisign on a temp testing cert.

So my inbound path is:  Internet > External Firewall > Cisco load balancer > Apache rev-proxy > Internal Firewall > Exchange 2007 CAS server.

I am doing the OWA testing using a Sprint Broadband card & I am seeing extremely slow access  to OWA, it takes about 3 minutes just to get to the logon prompt (this is after a warning about the self-signed cert). After putting in my credentials it takes at least 5 minutes to get my OWA logged in & I can see my Inbox. Other actions are slow after log in.

Where to start the troubleshooting?
someITGuyAsked:
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someITGuyConnect With a Mentor Author Commented:
It turns out I had an issue with the Sprint broadband card.
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e_aravindCommented:
1. What is the response/behaviour on the CAS server/LAN
2. a Fiddler tool attached with the browser from the Internet *would* show some timelines between the activities in the logon
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someITGuyAuthor Commented:
I am seeing nothing in the logs of the CAS servers, just informational messages.

Please expand on this "Fiddler tool" I am not familiar with it.
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someITGuyAuthor Commented:
I can fire up a Firefox browser on the Linux reverse proxy & I get through to Exchange very quickly. Accessing OWA internally happens very fast also. The slowness is only from outside.
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someITGuyAuthor Commented:
I have had a few other INTERNAL folks here try to get to the OWA & while I can access it most of my co-worker, on the same internal LAN, get a "Under Construction" error....
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someITGuyAuthor Commented:
While I am on a Sprint wireless card testing this from the outside I can get to my OWA but it is very, very slow. I just had a tech at Cisco test it & he gets a "Server not found"  error. I also had my GF try it from home & she gets a "Server not found"  error....  

What is going on?
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