Thanks to the update of iOS 14 in November 2020, most major web browsers allow you to view WebP images. But Internet Explorer and the old version of Safari (iOS 13 or earlier) do not.
The decoding of a lossy WebP image may take 2.2 times longer than that of a GIF image. If the image is lossless-compressed, it takes 1.5 times longer.
Popular image formats including GIF, JPG, and PNG have developed a long time ago, and they are well-supported on almost all websites. But uploading a WebP image is not available on quite a number of websites yet.