Google's John Mueller said on Twitter that there might be a small bandwidth savings with GoogleBot crawling your website when using Webp over JPEG image formats. But then you would only see this difference if the site is a "very image heavy site". On normal websites, there probably wouldn't be any bandwidth savings there.
Here was the question:
if you have both JPEG / Webp versions of an image. Is there an advantage / disadvantage if the WebP version is made available to the crawler compared to the more general JPG version? #SEO #Images #WebP @JohnMu @Kevin_Indig
– Tim Vereecke (@TimVereecke) August 26, 2020
Kevin Indig and John Mueller responded similarly:
– 🍌 John 🍌 (@JohnMu) August 26, 2020
Google's John Mueller added that "you shouldn't see any difference in terms of SEO for users".
Forum discussion on Twitter.