My Surly Long Haul Trucker feels really fast when I put 120 psi 25mm wide smooth and supple tires on it instead of the 80 psi 37mm wide touring tires with stiffer casing. With those higher pressure tires, I think I can win any race, climb steeper mountains, etc. I have two sets of 700c wheels, thus it is easy to switch the tires, do it a few times each year.
Then I get home from a ride after using the faster tires and reality sets in - my average speed is only about 3 percent faster when I use the faster tires. And, yes I changed the bike computer settings for wheel diameter, I am actually judging that 3 percent based on time to ride the same route.
Thus there is feeling fast on a bike and there is actually being fast on a bike, they are not the same thing.