I often find that RAP/UCAR is about one forecast step ahead of the NCEP model page. When NCEP is processing the 36hr FCST timestep, RAP/UCAR is on the 42hr FCST timestep.
I don't have my GEMPAK servers up and running since they tend to get way to hot (my server room, aka closet, get's up to 100-110F), but that usually comes in as the data is sent over NOAAport, or about the same speed as what the NWS gets it.