This might be a similar question. We can't seem to control our file sizes, they tend to come out massive 10 MB+ which I suspect is the norm for 30x42 @ 300dpi. Is this lost with the compression option? There seems to be that option with the print menu pop up. Does this get changed in the Document Preferences. For some reason I don't get feedback when I change the numbers in the dpi output so I'm not always sure what I get when I print.