What makes mountain bikes slower than road bikes?

I have a mountain bike with front and rear suspension, wide knobby tires, and a heavy frame.. if I get some road tires (still wide) for it, and lock the rear suspension, will it be easier for me to keep up with my friends riding their road bikes on the street? Or is it not worth trying and should I save my money up to buy a proper street bicycle?

By: konatsuchan

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