You have to remember that because a bow is made from natural materials, doesn't mean the performance is primitive by any means.
I've seen many all wood longbows that would shoot just as fast a glass/wood laminated longbow (with the same weight arrow) that was made yesterday. And that doesn't make me unique. dean can tell you the same thing. He's seen them too.
Our own badger, has shot all wood bows over 200fps.
Jay Massey built a sinew backed recurve that Ron Hardcasle and some others that consistently shot 185-190.
And these were actually shot through calibrated chronographs, so the numbers are real.
Those speeds are on par with any similar design bow being made today.