I take you do a full keyword routine? Why use folders and not a Smart Collection?
I went over the same issue, have a look at Smart Collections, 1000s iof images and no scroll bar and tghey all update at every import!
By the way the scroll bar goes on for ever!!
Yes I definitely have everything fully key worded. I'll take a look at the smart collections, which sounds like it may well the answer. Smart folders have existed on the Mac as part of the OS for a few years now but I have just never used them. Perhaps I am missing something major here.