J: is partition on a local hard drive on a motherboard SATA port.Is your J:\ device a local hard drive, external or perhaps network?
I took a 1920x1080 BBC-3 video here, and recoded it on my I7-3770:
1) using QS @ 2.5 Mbps: 99 FPS output, low CPU usage.
2) using software only @ 2.5 Mbps: 45 fps, high CPU usage. This looks similar to your system.
3) Then did a deinterlace / resize to 720p (iphone 2 profile) using QS.: 91 fps, high CPU usage.
This just means we need to dig deeper. What version of the Intel Driver are you running? You can find it using the device manager. As an FYI, I'm looking at adding that information to our QSync information box. It's just takes a lot of work to get that one small piece of info.
I just saw something else. If you don't force a recode by changing the dimensions, cropping, etc, the smart encoder will be used, and the Encoder setting is ignored. Try changing the output mode to "force recode"
I will try 'force recode' soon, have to go out now.
I assumed that my choosing to reduce the bit rate to 3000kbps would effectively force recode but I will try explicitly stating it.
I may also try recoding to MPEG2 as an experiment.