As a followup from performance review (T254950):
"I've noticed a very minor thing when testing the site out for performance. There's a 20kb image that's requested on every page and never displayed: https://api.wikimedia.beta.wmflabs.org/static/images/project-logos/betawiki.png
I suppose it comes from some CSS (as the default site logo does), as I can't find it in the HTML. There's probably some other CSS from the skin to hide the original logo, but not in a way that stops it from loading."