CPU usage in v2

Either:

Optimize what's implemented: probably will not make it very far, and will likely never match old usage

and/or

release a simplified version which should take less cpu, but have more artifacts.

PRs welcome!

What is a middle ground between version 1 and version 2 is to set the overlap factor variable to 4.

ok, in that case all that needs to be done is simply changing this line as necessary:

Line 150 in f2426df

overlap_factor = 8;