Magazine tests I have read on the RSV show 0-60 in about 5.5 seconds and 1/4 mile times around 14 secs or high 13s. That isn't Goldwing territory, but it isn't slow. I have cruised for extended periods as fast as the CC would let me (just over 80 indicated) and the motor seems to be just getting to its happy place (sweet spot).
As others have said, it isn't a 1800cc V-twin, it is a 1300cc V-4 and you need to rev it. If you shift it by ear like a V-twin, you're getting about 1/2 of the performance it is capable of.
http://www.motorcycledaily.com/21january03yamaha03royalstarventure.html