Not even remotely. The Vectrex has a 6809 so it can do hardware multiplies. But that Doom port is using a Raspberry Pi as the computer and the Vectrex just as a display. My Quake port draws about 30 lines at 5fps, not full screen.
I see. So in order to have something speedy and be able to recognize opponents it would be necessary to do things in PETSCII instead, just like Escape from PETSCII Planet?