Speaking of which, I’ve been meaning to point this out for a long, long time:
As far as I can tell, this rather large image that I’m using as a profile background is not resized in my profile pop-up. Every time I click my profile, it takes me well over a second to load the background. I’ve seen this in others’ profiles as well, and it’s quite jarring.
Even on my profile page, the background image ought to be optimised for screen size.