I like my background, it is nice, and tells a story about a TV series that is important to me and is going to air fairly soon, but rendering wise this has 2 serious defects.
When I visit a user profile we are not sure how much vertical space to take, so stuff jumps which is very offputting
It saves so much space that I don’t need to scroll anymore to see the summary, which is really what I care about, rendering would be way smoother and so on.
I think there are overall structural improvements that could satisfy both the desire for personalization and prime space utilization (amongst other things!) — that’s a fairly longer road to take though.
I don’t know exactly how Facebook does it, but they load a user profile with the page already scrolled a bit, so you need to scroll back up to see the full background image, and have access to the most common info right away.