You pretty much have to buffer a couple frames because that's how rendering works. You can do work to reduce extras, but it only gets you so far. And screens tend to want to buffer at least a frame too, and it's hard to convince them not to.

You also need quite high framerates to make rendered motion come out reasonably smooth. Especially for something you're trying to follow across the screen with your eye. Fake motion blur only partially helps and has its own problems.