No problem at all . I don't know what you did/changed, but is seems a lot of faster on my machine. It looks like the code is not using AVX instructions as my 8700k flies at 5Ghz, where before it was running at 4.8Ghz (due to AVX).New test build:
Didn't really want to do a new test build, but the previous one still didn't always accept the measurement files, this one hopefully will.
I did change the file format one more time, so you'll have to throw away your old measurement files and redo them - sorry!
I also upgrade LAV to 0.73.1 from 0.72.0 (maybe that's the reason). My GTX1070 is used at about ~35% (as per MSI's Afterburner) and it is not as heavy on CPU usage.
However I think there is a problem with measuring files using DXVA2 (copyback), at least on my setup the cmd window stays at 0% and it doesn't move. I have to use D3D11 in order to use it.