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e166ae0ed8
scaletempo2 has this optimization where it first uses a step size of 5 together with a quadratic interpolation to quickly get the approximate position of the best overlap and then does a more thorough search aroun that area. Doing the same thing in scaletempo brought a 4.8x performance improvement, however in my measurements a step size of 3 more consistently finds good overlaps and it's still a 2.9x improvement for this function. I should note that while a step size of 3 produced better numbers, I was not actually able to hear any difference in my test. A step size of 3 was chosen just in case it actually makes an audible difference in some cases and the cpu usage isn't really a problem anymore, but that can be revisited in the future. scaletempo2 is still faster then scaletempo with a step size of 5, which I suspect is mostly because it uses some vectorized functions and scaletempo does not.