I love the new Lightroom CC, it is seriously awesome. One thing that needs a immediate fix, tough, is the scrolling performance - it is super choppy. Please make it smoother, this would add a lot in terms of usability and performance perception.
I just scrolled through 8000 images on a 2018 MacbookPro and experienced a pretty smooth scroll.
Can you get us some system information? OS version Specs (RAM, CPU, etc) Installed Lightroom version (Help>System Info... Number of images in catalog Type of grid used: Square or Photo? External monitors attached? Time since restart?