chris greene told me that a big problem w/ the lagginess can be attributed to parrallel to USB connectors, and that you should use a PCMCIA to parrallel connector and it will help a whole lot
-Ben Martin

you mean serial

That slowness of USB-serial adapters is what I talked about here:
https://www.rx7club.com/wolf-3d-125/serial-port-vs-usb-adapter-562532/