Hi
when configuring the option "Image Device Pixel Ratio (DPR)" to "2.0" all images will be generated twice there original size, whether the browser is retina or not
According to cloudinary documentation, lazyloading has to be added to automatically deliver the best quality
$.cloudinary.responsive();
https://cloudinary.com/blog/how_to_automatically_adapt_website_images_to_retina_and_hidpi_devices