I may have asked this before
Is anybody familiar with the Fastnet profile?
Has anybody actually played one?
And if you have, what would you compare it to?
Taylor?

I've not played it, because necks like that are uncomfortable to me. But, it's an 11/16 nut and slimmer thickness where the thumb rests. Generally better suited for smaller hands but that's never a good marketing point so companies often call skinnier necks "fast" necks.

One thing to keep in mind is that less material means less support so thinner necks can sometimes be less ergonomic, even with smaller hands. For others, they're lifesavers. Really depends on the hand, the technique, etc. For instance, thickness doesn't affect me but the shape and width are important.