Making smaller plot files (50GB + 50GB + 50GB, etc until you hit 2TB or what ever) is not a good idea.
1- It simply creates a huge mess in your plots folder.
2-It does nothing to help you create your plot files faster. You're wasting your time doing that. You can do 1TB, 1TB, 1TB, etc or 2TB, 2TB, 1TB, etc. That's fine.
Just like @ryanw said:
@medo2016 More CPU power and a better connection to the hard drive is the way to make it faster. How is the drive connected, and what kind of cpu, and how many cores did you allocate to it?
Better CPU, better Read/Write speed to the Hard Drive, allocate more cores, close out programs and stuff to let the plotter allocate more RAM to use.