We have an RDS farm setup as follows:
1 - Web Access Server
1 - Connection Broker
1 - Gateway
2 - Session Hosts
Overall the implementation works perfectly, however, over time we've noticed its taking longer to launch an application. This is the cases whether you access an app via RemoteApp published to your desktop or via WebAccess. When you click an app the RemoteApp window opens up and the "details" button is grayed out. After 30 - 45 seconds the details button becomes available and the login process (which you can see if you click details) take about 5 seconds. Subsequent launches of applications takes only a few seconds as there is already a session established on the RD Session host. If you end that session you're in for another 30 - 45 second delay the next time you launch an app.
This was not the case when we first implemented the RDS farm. Only change to the network was upgrading the domain to 2008 (still with 2003 domains in the env)
Any suggestions?