Two types of Speed Control when putting a golf ball. Speed that keeps you from 3 putting and the speed required to make a putt. The difference can be staggering to consider.
Successful putting mechanics are a result of understanding 3 concepts. Inertia, Effort and Momentum.
I have never understood the consensus opinion that fast greens require a different type of putting stroke.
I have never understood the value of optimal numbers when evaluating a putting stroke. Wouldn’t the conditions of the putt dictate optimal? I think the optimal acceleration pattern for the sandbelt region of Australia decels into the stroke. Yet on poa in California, not so good.