That is a tough one! It is like asking “how big is a shoe?” or “What does a carrot taste like?”
There are so many different designs out there that it is impossible to say. For years the recurves had it as a whole but now there are a handful of bowyers (ACS CX carbon longbow, Bob Morrison carbon/foam longbow, Black swan archery carbon/ceramic hybrid) that are making the fastest bows on the planet and they are all skinny limbed carbon backed longbows. That is what makes traditional archery so darn much fun! Someone is always making a better bow so that we have a harder time deciding which one to buy.