Perhaps this isn't a good ServerFault question, but here goes:
We've got some Canon ImageRunner copiers, and the performance is terrible for printing PDF files. For instance I just sent a job that's 11 pages, and it's taking some twenty minutes to print. A page comes out...then it sits there processing...another page comes out...and it sits there processing...and so on. This particular machine is an ir6020.
Some PDFs don't take as long as others, but for the most part they all take a very long time. I've tried the latest drivers, both PCL and PS3. Currently I'm trying the 4.62 drivers from Canon Canada (the latest from Canon USA is 4.55). Our Canon rep hasn't been very helpful. Thankfully we don't print a lot of PDFs...other documents come flying out of the machines nice & quick.
Update: I was able to print the current document I'm having trouble with by using the latest 6.62 version of the PCL driver. I don't believe this problem is gone, however, since I've been battling it for a long time, and sometimes the PS3 driver is faster, sometimes the PCL driver is faster. I can't find a pattern.