Sometimes I would also like more fine-grained upvotes. Clever doesn't feel right for readable / maintainable but with underwhelming performance; Best practice is only for maintainable and performant.

Downvotes are a minefield I can see CodeWars not getting into.

even though the slowness of it is sometimes frustrating.

It is not new, there are several issues on github like https://github.com/Codewars/codewars.com/issues/1891

Something like 'Good/bad performance'.

You use 'best practices' and 'clever' for those too.