I don't know a better way to explain this, so I posted a video to Youtube of the issue. It is recorded from a cellphone as using OBS to record this would not show the problem. OBS has Priority set to High, it is using all four cores.
https://youtu.be/XUUnMXD_REo
I5 7600K
GTX1060 6GB version
16GB RAM
Windows 10
https://youtu.be/XUUnMXD_REo
I5 7600K
GTX1060 6GB version
16GB RAM
Windows 10