I travel a lot and have gotten quite used to browsing on airplane WiFi, so a similar low-bandwidth experience (at times). I'll add a huge culprit to the list:

I travel a lot and have gotten quite used to browsing on airplane WiFi, so a similar low-bandwidth experience (at times). I'll add a huge culprit to the list: Medium. They have their own "clever" code to progressively load images and I find it absurdly frustrating (because in most scenarios, the images just don't ever load), so I end up with lots of design articles with blurry blobs of color instead of images. There are so many ways to natively progressively load images that I'm not sure why they've chosen the most user-hostile one. You see blurry blobs of color in no particular order, no indication of which ones are loading, no way to force a particular image, etc. I find myself frustrated often and I end up abandoning most of the stories (or avoiding Medium altogether).