yes, the display is large. I love it 
DELL U3415W, 3400 x 1440, 60Hz, 8-bit depth RGB.
Scaling is 100%
I also have a second display, but it is turned off most of the time (and it was off during the lagging problem)
Wacom Cintiq Pro 16
I had this orbit stutter randomly show up, and for whatever reason running Sketchup as administrator fixed it (Windows 10)