Thanks for the response, BD. Definitely a good thing to know about the printers and drivers.
Because you can insert bitmaps into checks and other specifications, the file size of the pages can be significantly larger than typical printed reports. If you insert a larger bitmap and shrink it down within the spec, it still keeps the original file size.
If you are using bitmaps on your check specs, perhaps you can resize it in a graphic application (even MS Paint) and re-insert it into the spec. If the issue has to do with memory, then perhaps this can help save some.