Digital BW, The Print

Sorry, if this has been beaten to dead already.
But I have asked this on several other groups, and havn´t got an 
answer which solved my problem so far.

I´m on a Mac G4 with 1.5 Gig RAM and a lot of hard disk space.
I´m running several Epson printers from 1160 up to 7500 under 
OS 9.2 without problem. I dedicated a 10 gig partition as a spool 
disk for all my Epson drivers, and since then never had any 
spooldisk overflow - even if I print multylayer files in PS with 
hundreds of megabites.

Now, if I want to print the same files under OS X my printers 
become awfully s l o w. I suppose this is caused by a kind of 
memory- or spooldisk overflow. I have been looking for a 
configuration option to dedicate mor RAM or a specific spool disk 
to the epson drivers, but didn´t find any. 
Is this a common problem or am I missing something?
Help is very appreciated.
TIA
Bernd
.