Hi Ben,
Thanks for your response.
I stopped using WP retina 2X because it uses the attribute w : so it basically does the same thing than letting WP deal with responsive images via srcset list…
I think it is not about choosing the large version for the featured image instead full size. This should be directly done by the sizes attribute of srcset. On homepage, I have actually the same problem with all featured images that appear : It loads the big 2500px because I guess my viewport is 2880px. Thing is these image are half the size of the viewport (maybe less) so the browser should use a smaller one in the srcset. What do you think ?
Thanks,