I have ridden with everything from Harleys, Kawasakis, Suzukis, Yamahas, to most major models of the Honda such as old and new Gold Wings, VTX1800s, 750 and 1100 Magnas, Shadows, you name it.
The VTX 1300 is somewhere in the middle, not a racing bike, not a beauty queen, but offers some of the most desirable bike features.
As Dakota says, don't let the cc rating fool you. One of the fastest cruiser bikes out there now is the Magna 750cc. It will run with the best of them. Believe it or not, the VTX 1800 has to hump it to outrun one. 4 cylinders and 4 carbs make all the difference in performance. If they had a shaft, I'd be owning one today. 2003 was the last year they were made.
I'm happy with my almost stock 1300C and don't give much thought to speed, engine size or whatever.
While riding with other bikes, the VTX1300 keeps up with the pack and won't let you down. If my bike is ever too slow to keep up, I'll find other riding partners. The 1300's 110-115 mph is too much for me, unless on a flat straightaway without inlets.
Ride safely and enjoy YOUR bike. I certainly enjoy mine