Looking at the setup, it seems its just lightweight HTML pages for the articles but hosted by Google instead and the first 3 or so are preloaded.
Here's the page for NY Times article: https://amp.gstatic.com/v/mobile.nytimes.com/2015/10/08/us/r...
Honestly though any simple HTML page like this will load fast (see: HN) so publishers could've just done this the whole time and everyone would have fast loading pages.
Looking at the setup, it seems its just lightweight HTML pages for the articles but hosted by Google instead and the first 3 or so are preloaded.
Here's the page for NY Times article: https://amp.gstatic.com/v/mobile.nytimes.com/2015/10/08/us/r...
Honestly though any simple HTML page like this will load fast (see: HN) so publishers could've just done this the whole time and everyone would have fast loading pages.