[ENGNR]

How about a similar lightning bolt for sites with < 1s loading time and no popups that just show the content?

[dx034]

In that case it should be relatively easy to provide an AMP version of the page. If you already offer a lean page, it's not much to change.

[shakna]

Adding AMP will actually make the pages heavier in many of these cases.

It seems counter-intuitive to slow a page to get a lightning bolt.