Makes a speed difference in my bows. 3 to five fps with the heavy exotics compared to light woods like myrtle, maple , walnut, zebra, elm , ect. If a person buying one wants a top speed bow then I recommend the lighter weights.
I grind all my veneers to .o15 to keep them from effecting performance. Not necessary probably but I do that anyway. Exception is when the wood is a good performance wood which I would use for core with no problem, such as zebra and tigerwood.
I would imagine that different bow designs and different pursuits would change this but its true in my bow designs.
Macassar has been a real poor performer for me. It has consistently given me bows that shoot 5 fps or even more slower than my same bows built with different woods. I avoid it and rosewood and cocabola and bocate pretty much in the limbs.
This is simply an opinion based on my personal experiences.
God bless, Steve