How (or which) to select a processor for OpenCV calculations?

Question

Iron

Good day!
With the help of OpenCV (C ++, MinGw) I search for an object and further actions to calculate the exact position.
I rarely use functions
: getRotationMatrix2D, warpAffine, very often (in cycles): zeros, copyTo (with ROI), absdiff.
Optimized as much as I could, but now copyTo and absdiff take a lot of time.
On the GPU is not an option. Now I use 2 threads, more - it does not parallelize, because copying and synchronizing between threads will take longer. Memory eats little, about 400 MB in extreme cases.
So, the question itself is what parameters to choose the most suitable processor for such tasks (desktop)?
I think it's not just about gigahertz, is it?
Can you recommend a specific model?