If it should be nearly instant, then I see slowness as well, but eventually the data does come up. This is on a quad cpu 3GHz with 4GB, 2GB free.
For example, with 7 ESX hosts it takes about 3-4 min to bring up the tops for Virtual Infrastructure. For an individual host, it's around a min.
We are using the SQL software included in the package. Advanced scalability is off.