I have the beta installed on my 4 1/2 year old Thinkpad T42p. I don't really have issues with search speeds or indexing speeds. But I'm really having trouble with the interface's responsiveness.
It takes more than a second for a window to close after clicking the X. When I grab the scrollbar in a resource and pull it down, it takes upward of 2 seconds for the window to catch up with my mouse. Just about anything that uses a window control takes around a second to respond to the mouse.
Other things seem fine: Typing in fields is not a problem. The resource menu (clicking on the book cover) is pretty responsive. Navigating a book with the TOC is also decent.
My Thinkpad is a Pentium M 2.0 GHz with 2GB RAM. I have not experienced this trouble running other apps, including LDLS3. Am I outside of the performance envelope?