I have 10 cameras, in total 3MP@85fps, 1MP@5fps; doing 3000 kB/s according to BI, everything recording, motion detection on 6 cams.
It takes on average 110% CPU time when minimized on i5-4590@3.3-3.7GHz ~ 28% cpu usage in task manager. 130% CPU time when using the demo version ~ 32.5% cpu...