Here are some things to look at....
1. are you dial up or network connection? Dial up connections are extremely slow.
2. If it is network connection, is your NIC a 10mps or 10/100. The former will be slow for a TS connection
3. How muchmemory do you have on the server your are running. Idealy you need for minimum, 32meg RAM for EACH client that is connecting with Terminal Server Client (TS). Plus you will need additional memory for other server processes.
4. In your TS Manager,see what processes are being utilized for that particular user. Perhaps they are using some process that slows everything down.
5. I have experienced that additonal connections above 7 or 8 will start slowing the server down, no matter how much memory you have. Each process and each user are using a 'time slice' of the processors time.
6. You should also check the taskmanager on the server and see if there is any process that is slowing things down.
These are the things that I would check and have found answers to the problems that I have experiences
good luck