sorry to hear that, but I think You should further explain, what is slow?
Your hardware specification sounds well, I have an much older and not so good workstation here, doing a good job.
So Your system should perform even better, without any problems or slow downs.
But again, what is slow?
Head to Options (Application button > Settings > Options) in a new part environment, and in the view tab > application display, choose graphics card driven (advanced) or just graphics card driven.
This has fixed up the issue for me so many times that I can't even recall.
What version of Windows 10 Pro are you using? If it is the Fall Creators Update (version 1709), you are likely seeing the issue being discussed in this thread:
The symptoms you describe sound the same.