I have a CX bike with Schwalbe X-One 700x33 tires, which have knobbly profile designed for mud.

As I've been faster on the bike, I've started to feel that the tires might be adding a bit of drag (they certainly add noise), and wondering whether I would be better off with getting a different tire (or a whole new wheel set) for rides on pavement.

Given the same tire width & pressure, how much difference in handling and actual speed would I be likely to notice?

If I chose to get a complete wheel set, are there any recommendations that would be compatible with the current Giant PX-2 rims on my bike? (The group set is SRAM Rival 1 (11-speed, 11-32 cassette).

Thanks!

John