Another thing with those suits is that they act like a corset around the midsection, keeping the body that much more tight, compact, and streamlined. They're actually faster than bare skin, so nudity is out....
As for being a fast pool, part of it has to do with materials and they way it absorbs the waves and turbulence, which I won't pretend to fully understand. Another factor is the empty lane on either side of the swimmers as someone mentioned above. More distance between the swimmer and the walls means less turbulence bouncing back off the walls to have to swim through. Same goes for pool depth - the deeper it is, the longer it takes the waves and turbulence to return to the surface. The type of ropes used also play a factor in cutting the waves, as do the design of the pool edges and how they take in water.
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