I just tried again with the latest version from your github. I’m still seeing a drop in performance compared to the vanilla source.
My system went from ~7100 to ~4200.
This particular system has dual Intel Xeon Quad-Core CPUs (E5335) @ 2.00GHz.
Re: 4 hashes parallel on SSE2 CPUs for 0.3.6
Figures: aceat64