I didn't understand, at the time of its last major refresh which was a fair while ago now, how SourceForge could be so resource intensive — all it needed to do was show links to download files. That was it.
Instead, it was packed to the rafters with Flash ads; the layout was bloated with unnecessarily large, unoptimised graphic files; and, the most prominent button to download didn't actually do that — it would take you to a page where you could select a server to download. That's your job, SourceForge, not mine.
I think that design comes from another era. All I've seen happen to it since is cutting out some of the graphics, changing the colour scheme a little, and switching to HTML ads. It's still from another era.