Tis slow. My computer is up to spec: I7 2600k, 16 GB ram, program on SSD, catalog on another SSD. I can imagine the hurt on a lesser spec machine.
Opps wrong thread, next one down 'LR 4 slow'. On this topic - who cares. An extra $0.50 cost of drive space.
I don't really notice any speed increase with the SSD's.