Retina CPU usage.

We are running Retina Network Security Scanner 5.16.2 with 2552 audit engine. When doing a scan, the retina.exe process never exceeds 25% and takes forever. We are running a 2 CPU / Dual core Xeon E5410.

Is there any way to make the app use more than 25% of the total CPU usage (multi-threaded)?

Thanks!