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With regards to 'hunting'--our hunting regulations mainly mentions the minimum draw length, arrow length and draw weight in respect to a longbows, crossbows or compound bows relative to the game you're hunting.
All three of the above aspects will produce varying arrow speeds and kinetic energy.
The minimum kinetic energy requirements varies with the game in question, thus the basic guidelines to enable bows to meet the necessary specifications.

Enough speed means that you can accurately and consistantly hit at what you are aiming at.... That could be taken two ways though, either 1) It does not matter what speed you shoot at as long as you can hit what you are aiming at...or 2) You won't be shooting fast enough until you can hit everything you aim at.....
...I prefer the former....

On a more serious note, you are going to hear a variety of opinions on this in regard to trajectory, kinetic energy and momentum levels, shot placement, etc... But, what it all comes down to, in my opinion, is what I mentioned above.

Jim
IMO there isn't a newer bow out there that doesn't produce "enough speed".
How much speed you need, is really a personal preference. More important to me is a correct fit, a good tune, straight arrows and broadheads, and plenty of practice.

For use in hunting I agree with the crowd. How much speed is enough> Let's put it this way. Archers with 45# recurves shooting aproximately 150fps get complete passthroughs on deer sized game. Compound bows of today generate speeds anywhere from about 225fps to 300+fps, so what do you think the resulting penetration would be on deer?

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