The hardware acceleration is turn on, running direct-to-disc, 15 fps and the cameras are Hikvision DS 2CD2032
Something is wrong, you pc should handle that just fine.
First, check each camera again and confirm you are recording direct to disk, Hardware decoding is on and you are recording to BVR (
blue iris dvr format). There have been numerous times where folks have missed a camera or two.
Second, set the live preview rate to 10fps. Blue iris options>cameras, this will not affect recording.
Are you logging in to this pc using remote viewing software? or using a local monitor?
Are you using intel hd video or is there a discrete card in the system? (blue iris needs intel hd for HA).
Have you set hardware acceleration to h.264 and NO VPP..make sure VPP is off.
are you running the cams at 3mp or 1080p?