SQL Reporting Services Performance On Navigation Pages.

I am experimenting with SQL Reporting Services on a machine with SQL Server 2005 loaded and deploying
reports to a different server. both servers are equivalent in resources.

In the browser on the Reports machine when I first go to the Reports address, it takes a very long time
to build and load the page. it then takes a long time for each drilled down page. Subsequent calls to the same
pages are very fast if done within a certain amount of time. This implies that there must be some form of
caching going on and that the cache expires after a period of time. I have seen in the RSReportserver.config
file that there are parameters relating to report caching, but they all appear to reference the actual reports being
generated. My issue is simply being able to build the start page and other navigation more quickly and to
keep it active so it does not have to perform that build each time.

Any information related to managing this situation would be very much appreciated..

Thank you, Ray