My project had a lot of sprites (animations), and when I was exporting with PNG recompression Standard, it was as slow as brute recompression.
Previous that r75 was two or three minutes, but now is half hour and don't finish yet.
If PNG recompression is None, I don't have problem.
I'm not sure if this is a bug, but before I didn't have this problem.
PD: My project is a big folder, then I can't upload this.