@Ilwrath:
It helps a bit, but it depends alot on how demanding communications software you are using. If you are going for example browse the web on an AGA Amiga in more than 64 colours, I wouldn't bet for more than 38400-57600. In this case though where you simply are going to transfer files over a nullmodem cable, then Term in combination with 8n1.device is a real rocket. And before anyone asks - NComm is slower and quite buggy too.
/Patrik