We are using import mode.
All of the reports that have a lot of data are slow to run the first time. But after running one of the reports, the others reports that has not run yet will still be slow. So it is not a state for the whole report server, each report has to be opened one seperatly in order to open fast.
To me it seems like when the report opens, its model is cached in report server, the next time someone opens the report it will open fast.
We need something like a warmup script that opens all the reports, or, preferably, if there is a function in report server that handles this. Can't be only us having this issue.