that's a $700 video card. The 1060 is a $200 video card. I would hope it would be a massive improvement for that kind of scratch!
To give you an idea on what ive tried.
System is 6600K, Z170a MSI board, 2TB NVME SSD, 1080ti
Ran this system with 10.12.various - 100% fine.
Ran this system with 10.13.2 - all the issues being talked about in this thread.
Ran this system with 10.13.2 - with a RX580 - no issues
Ran this system with Vega64 - no issues.
Ran this system with a normal, 1080 (non ti) same issues as this thread.
Its not just slowness.. the issues are wider than that if you really look. I feel like over time i became accustomed to things, like small pauses, finder lag, a weird high CPU for windowserver, window resize issues, moving windows between screens, 4k performance issues.
With the VEGA64 everyone of those issues is gone, as it was with the RX580.
Based on that - appears Nvidia driver related.
My partner has a imac with a nvidia GPU in ... 10.12 was fine, 10.13 all the same issues.
SO the thread should probably be renamed to 'Nvidia issues with 10.13'