This will mean that all the image data is decompressed, and then recompressed into PostScript, which is probably where the time goes. My guess is that CUPS is converting it to PostScript for the best quality output, using Ghostscript to do the work. So you need to create either a PostScript or PCL representation of your PDF file (because that's what your printer supports). PDF files look enough like text for that to happen. In the absence of instructions the printer assumes what its being sent is PCL and PCL is specified so that if you send it text, it just prints it. The printer doesn't support direct PDF printing which is why sending the PDF file directly to it doesn't work.
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