I'm a level 3 snowboard instructor in Canada, and I would say I infrequently go over 40km/h. It's only when I stand still on a groomer and "go fast", or for the run-in for the L/XL jumps.
Have you actually measured your speed though? Because the difference in speed sensation between a snowboard and a car (or bicycle) is just unbelievable if you haven't measured it.
The pull rope I linked above is for kids with small/medium jumps, and that's 40 km/h.
That's interesting. Way back when I was a ski racing kid (about 14) we once did a speed test where we closed off 400m of one of the children's slopes and put a photocell at the bottom, and we would hit 90+ km/h on that thing. Mind you, this was in racing gear with racing skis, but that was a flat-ass slope. The fastest we ever clocked in a race was around 120, when I was 18, in the worldcup downhill course in Åre.
