Feature request - tweak the lazy loading

[pkarw]

What is the motivation for adding / enhancing this feature?

Currently we're having lazy loading which is not optimally configured; it generates placeholder urls in the SSR mode - so the first view of page is always: https://www.dropbox.com/s/6c0xnn2x21hhtgm/Screenshot%202019-09-05%2014.22.40.png?dl=0

... the SSR markup is generated like this:

https://www.dropbox.com/s/jl04iona7ht5g1f/Screenshot%202019-09-05%2014.23.58.png?dl=0

... and the images are being then downloaded. The first 6 (desktop) 1 (mobile) images should be always eagerly loaded + moreover we should have proper src="" set in SSR markup