Be certain Use Maximum Texture Size is disabled. (unless you have good reason to have it on) Window > Preferences > OpenGL > disableUse Maximum Texture Size
While the graphics card should by and large be OK with SketchUp, it is still one that Nvidia describes as “entry-level”. It might be a bit low key for the workstation you describe, but it should still have better performance than the old QuadroFX 1800 card I use at home quite comfortably.
This computer used SSD drive, therefore I optimised it for SSD drive (simply google Windows SSD optimisation)
Antivirus - I excluded page file, SketUp process and SketchUp folder, plus I did exclude SketchUp file extensions. (there is no point to scan for any of these, as this is trusted software)
In Windows you disable all unnecessary services and programs they did not need (again, refer to Google for it)
I would like to do even deeper optimisation - in BIOS and driver settings - but I will need to come back to them and share results with you, if successful.