One thing we have noticed in using our Oki 3641 with a Fiery Rip is a large difference in the speed at which # 10 envelopes print. Usually it prints in the 27-35 range per minute. However some will print at a 40-45 minute rate. No difference in how the envelopes have been sent to the rip, or the settings on the rip. Of course we would like to run them all at the 40-45 rate. Is their anything we are missing in the setup on rip? or, in the document? No difference if we change media weight, size @ 10 or custom. Thanks