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It looks like Google Pagespeed Insights is complaining about the use of WebP images above the fold. It complains about the critical path. When I change the images to .jpg, the problem is solved. But that’s logically not what I want.
Did anyone see this before?
I honestly don’t know very much about webp images… a little searching did return some results of similar issues to your own, no real solutions though.
If your page is loading reasonably fast, I wouldn’t get too concerned about what pagespeed insights is reporting.
The page is a lot faster with WebP images.