Yeah, also the I/O overhead itself is deadly. Figure a full page image in strict black and white @ 300dpi is going to be around 10MB (less with compression, but still). Consider how long it takes to send 10MB over any Amiga port... (even a hypercom...) :-(
The only thing that MIGHT speed you up would be to throw a JetDirect card in the printer and network it off an ethernet card in the Amiga. Even this might offer no speed increase, though. The bottleneck might still be working with such large page image files on the Amiga.
