As far as whether it’s fast on gravel, lots of that depends on the engine I suppose, but I find I am faster because I don’t have to worry as much about what line to follow, especially in heavy gravel. The WTB Horizon tires aren’t great for gravel though, unless it is dry and flat. I switched to Ventures and found them to be a great all-round tire. I’ve ridden the bike in dry, rough conditions, peanut butter mud and -10C winter gravel and never felt like the bike couldn’t handle what I was riding in.