PDFs always get 2-3 time larger as the original

[LMSSonos]

Hi

As soon I start to process the images in the PDF using ocrmypdf my PDFs always gets larger than the original. So here are my examples including I test file test-scan.pdf:

Only optimization: Ratio 0.81x (as expected)
ocrmypdf --skip-text --optimize 3 ./test-scan.pdf ./test-scan-out.pdf

Only OCR: Ratio 1.64x
ocrmypdf --force-ocr -l eng --optimize 3 ./test-scan.pdf ./test-scan-out.pdf

OCR + Image optimization: Ratio 2.85x
ocrmypdf --force-ocr -l eng --rotate-pages --deskew --clean --optimize 3 ./test-scan.pdf ./test-scan-out.pdf

When I open the PDF in Acrobat and optimize, it usually gets smaller than the original.

Any ideas or hint's what I'm doing wrong?

Thanks

[jbarlow83]

Using force-ocr causes all pages to be re-rendered as images in the widest colorspace and highest resolution used on the page, which will typically increase file size.

--redo-ocr might be helpful

[LMSSonos]

Thanks for your suggestion. The --redo-ocr works for the second case without page optimization

Only OCR: Now ratio is 0.81x instead of 1.64
ocrmypdf --redo-ocr -l eng --optimize 3 ./test-scan.pdf ./test-scan-out.pdf

If I run the second command to optimize the images as well:
ocrmypdf --redo-ocr -l eng --rotate-pages --deskew --clean --optimize 3 ./test-scan.pdf ./test-scan-out.pdf

it outputs: --redo-ocr is not currently compatible with --deskew, --clean-final, and --remove-background

So to come over this issue, I used ghostscript to remove the tagging and set it to untagged.pdf

Then the issue persists, file size is 3.58x
ocrmypdf -l eng --rotate-pages --deskew --clean --optimize 3 --output-type pdf ./untagged.pdf ./untagged-scan-out.pdf
If I remove the --deskew size get's only slightly larger 1.14x in my case

Is there any option to keep it small even using --deskew?

ocrmypdf version 16.10.5.dev10+g66308c281.d20250818 (Docker, also tested directly on ubuntu)