Why do I get cf_polish=not_needed on large images? For instance: https://assets.thejewelleryroom.com/wp-content/uploads/2019/05/OLC-23.png - if I manually convert it to webp it’s size gets from 473kb to 160kb… so I wonder why cf think’s its not needed.
Also PageSpeed Insights says: " Serve images in next-gen formats. Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption." - but I guess having enabled Polish for whole domain should fix this right?