I just got my Trek 830 and I LOVE it but it is a bit sluggish because of the tires. I'm inexperienced in the wheel rim parts.....can I just put any tire on it? I want to get a tire with less resistance (a little smoother).

Right now it's a mountain bike tire (lots of tread) and 26" x 2.1"

I would love any knowledge you can share on the subject!

Thanks in advance