I have a brand new Alienware m15 R2 Laptop, and I am getting some pretty noticeable lag in Windows just on applications and windows in general. Even minimizing / closing / maximizing a window is laggy. When I open the Start Menu on an extended monitor, that is also very laggy.
Currently, I have one external 4k monitor connected via DisplayPort, and two more 4k monitors connected via a StarTech 4k USB-C HUB.

Any thoughts or suggestions on what I can do to improve performance?

Alienware m15 R2
Intel i9-9980HK @ 2.4GHz
16.0 GB RAM
GeForce RTX 2080 (442.59 Drivers)

Well -- now that I am WFH due to COVID, I can't test. Maybe in a week or two I can follow up