I am checking my website speed in Google PageSpeed I face the Serve images in next-gen formats issue. According to it, Google recommends you to save images in JPEG 2000, JREG XR and WEBP formats instead of old PNG and JPG. Best of all - WebP.
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Fortunately, there is no problem that wouldn't have a solution. So, to solve the Serve images in next-gen formats issue you have to install and enable the Magento 2 WebP Images Extension.