We don't use a server for the program; it's installed on individual machines. And there are 4 of us here. My experience is it's slower but not slow enough to slow us down much.  Closing out year-end did take much longer than usual - 2 or 3 minutes per client compared to 10 or 15 seconds before.  But getting into and out of the client accounts or running reports didn't seem to take minutes at a time, just a few extra seconds.