SCSI devices DON'T NEED INTENSIVE CPU LOADS!
Like Piru said, ONLY if you try to burn ON-THE-FLY archives you will get in problem.
SCSI controllers handles the data in the SCSI chain by itself. So if you generate an ISO image FIRST AND burn it in speeds lower than 32x, you don't get a single problem with it.
Please don't compare the lightweight and elegance of Amiga's OS with the ignorance and brute force of those crappy M$ winblows.
Only the supplied software who comes with the device itself need that stupid configuration to work.
I am clear enough?
Sorry if those words offends you, in any way.