You’re wrong. Just because it’s not the absolute peak of efficiency, written in C with asm routines to talk to the db, doesn’t mean it’s not efficient.
Performance and efficiency aren’t the same thing. Django does a lot of things other frameworks ranked here don’t do.
Such framework rankings are also utterly irrelevant when you want something widely used enough to easily find contributors and integrations. That restricts you quite a bit more than “any so called framework that just handles http”.