So that's why a 2 systems were getting crappy speeds. Yes, 2. It had been used only to split a single drop from another switch between two systems.
New drop, happy clients.
Some stuff here is museum material.
Rock and roll. I've seen bad things happen when someone decides it's a good idea to modernize a PC based CNC control. (I hate PC based controls). They get their own little fence to live inside where it's always 1999.