I got a call that printing has suddenly become slow. Eventually I tracked it down to some files in the C:\Windows\System32\spool\PRINTERS folder and there are some shockwave files there. It is more or less what this guy experienced, but no real resolution was posted, just how to delete the files.
I can delete the files once I stop the spooler service, but as soon as someone prints, they just come back. Environment is Win7 64bit and 32 bit workstations with SBS 2008 if it matters. Also, the actual files, show 0k, and when opened with notepad, are empty.