Sorry -- -I guess i was in a hurry.
The M451 is conncected to a PC with an AMD Athlon 64X2 CPU and 4 Gb RAM, so I don't think the issue is a slow CPU.
Even when the printer is off, HPLaserJerservice.exe periodically grabs CPU cycles. What is it doing? This is an issue because CAD and heavy graphics work give the machine a good workout anyway, so I do not need any freeloaders.
Thanks,