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@DNSB
Yes, it's a good idea, i think i'll do this, thank you!
Since in a big epub, most of the datas are Jpeg images, they are uncompressible lossless and the fastest compression mode of the whole file is almost as good as the slowest.
But we can recompress the images and play with the resolution. If the input images are high resolution and low compression, we can obtain small and very decent output images with the good balance of settings.
However, as i said, this 15:1 ratio compression is quite exceptional, and most of my epub are already very small. I should maybe point out that the images didn't contain text, only illustrations.
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