I really hope this is some driver bug:
https://www.youtube.com/watch?v=mFSLro_OXLQ
Edit!!
There seems to be an issue:
https://www.reddit.com/r/nvidia/comm...text=8&depth=9
https://www.reddit.com/r/nvidia/comm...ussion/e7moxv5
There seems to be a performance loss down to combination of the new drivers and the latest Spectre/Meltdown mitigations in the 1809 patch.