DBW: suggest the use of client hints

[ebidel]

e.g. if the device 400px wide, "why are you sending a 1200px wide image?"

https://www.chromestatus.com/features/5504430086553600

How? Grab all images loading by off the network, check their instrinsic size. Determine if they are too big given the DPR and size of the viewport tested.

e.g. Given a 2 DPR device and a 600px viewport, the appropriate image should be 600px * 2 = 1200px. Anything else is wasteful.

[olingern]

Hey @ebidel, I'd like to jump in on this one!

[ebidel]

Sweet! This one might be more involved than a "good first bug" :\ It'll involve a couple of gatherers and some promise magic. There are a couple that might be even easier to start with:
#871
#718

Let us know what you'd like to tackle.

[olingern]

@ebidel I like a challenge 😄, but #871 sounds like a good stepping stone to this one. I'll pick up over there and see if I can send over a PR sometime soon

[patrickhulce]

addressed by #1497