That's why I don't want to support old cards: if I support them officially but not optimize you will blame me that they have bad speed.
But feel free to modify/optimize sources for your hardware
I'll be honest, your kangaroo finds the key faster than mine or jlp. Yes, the speed shows less, but in the end it finds it much faster. But feel free to modify/optimize sources for your hardware
Works even on 1660 super (~600Mkeys/s).
Thanks for sharing.