"webp" file format (for pictures) 
Auteur : Vida N.
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I think X5 software would be better if it support the "webp" file format.
The webp file format is much better than jpg.
Google webp comparsion:
https://developers.google.com/speed/webp/gallery1
"WebP lossless images are 26% smaller in size compared to PNGs. WebP lossy images are 25-34% smaller than comparable JPEG images at equivalent SSIM quality index."
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Vida, you may well be correct, but Optimizer can work wonders in the interim. I just reduced the size of a website from 2.08gb to 364mb and it looks just as good and loads dramatically faster.
https://www.websitex5.com/en/utility.html