Not so! Plenty of tests have shown that the WB causes anywhere from 2-7 fps loss in speed. Nothing near 20-30 fps. There has to be some speed loss. There is friction involved.

That being said I do not and will not use a WB for my own reasons. One of them being the potential for less accuracy. Not that the rest is less accurate, but that because the arrow is held in place during the shot the shooter must have a good follow through until the arrow completely leaves the bow, whereas with a conventional shoot-through or shoot-around rest the bow can move a little without affecting the course of the arrow.

Proponents of containment rests often use the analogy that they could shoot the bow while standing on their heads or with the bow upside-down. Probably true, but when was the last time you ever heard or saw anybody shooting a bow standing on their head??????????