RTMPT problem

I was testing rtmpt today (unfortunately one of our clients' firewall is blocking rtmp even through port 80). Each video (or connection probably) taking an awfully lot of time to load up (15 sec). We are testing with FMS 3 and latest Flash client (9).

Ours is an interactive video app. So this is not acceptable.

Is this a standard behavior (I hope not 😞 ) ? Can we make rtmpt work as good as rtmp (of course, the network overhead is acceptable)?

I am using rtmpt://server:80/app/stream as my url. One more thought comes to my mind. If it cant do rtmpt (some config mess up on my server), does it still fall over to rtmp. In that case too, there is some hope for me to fix something. How do I know if it fell over to rtmp?

Any leads on this would be extremely helpful.

Thanks
Siva.