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Yesterday, while I was bug hunting on a document I experienced a nice way to save some bytes. So I made some tests, which might be helpful for others as well? But don't expect too much, but if you want to streamline your document, this is worth a try. Or I wrote my typical nonsense. Test document 1: CMYK, A4 with a linked TIFF just placed = 1.881.016 bytes Test document 2: CMYK, A4 with a linked TIFF inside a picture frame = 1.879.646 bytes PDF export (preset X-4) Test document 1 = 3.412.180 bytes PDF export (preset X-4) Test document 2 = 3.412.182 bytes Observation: Only 2 bytes saved in comparison to the picture frame. The image was in width larger than the document, so I made a crop in both documents to the margin. PDF export (preset X-4) Test document 1 = 3.247.183 bytes PDF export (preset X-4) Test document 2 = 3.326.495 bytes Observation: 79.312 bytes saved in comparison to the picture frame. Now I was interested what would happen, if I change the height of the crop rectangle. I expected that the difference would be more or less equal. PDF export (preset X-4) Test document 1 = 2.952.002 bytes PDF export (preset X-4) Test document 2 = 3.042.883 bytes Observation: 90.881 bytes saved in comparison to the picture frame. This is interesting. I thought of the cropping rectangle as a mathematical definition of dimension and position. But there seems to be more than that, saving again approx. 11.000 bytes. Conclusion (for me): Where possible using a directly placed file instead of putting them inside a picture frame saves some bytes. I wonder how much can be saved in a very large document?