I’ve not only noticed this with my designs, but with many users. My desktop pages remain in the high green, but mobile pages are in the high amber according to page insights. For me it appears to be rather common.

My latest is Nipawinmuseum.org. I’ve yet to do some image naming.

I’ve used placeholders for any hero images, designed my own navigation, and slow loading on any YouTube or maps for directions, and still the pages load a little slower on smart phones. Not drastically slow, but in the amber range. I’m using the same images on the phone variant. Fonts are Raleway and open sans.

I’ve finally found the sweet spot for my images on the desktop. I’ve used all the tips and tricks from our pros on the board.

I just can’t get the phone viewing into green on page insights. Could this be a general rule?