ue Iris. Leaning a new system would be time consuming as I'm using a lot of the advanced features. I think DVRs are more basic than what Blue Iris offers.
blue iris has a direct to disk function, so when you're recording the video stream can be sent directly to the hard drive (kind of)... instead of the cpu having to re-encode all of it (which is what uses up all your cpu time)
you need a cpu with "Intel Quick Sync Video"
check this list... https://ark.intel.com/Search/FeatureFilter?productType=processors&QuickSyncVideo=true
and pick a CPU which has it... it'll make a massive massive difference
:-)