It's not "written too slow" if you e.g. only get 50 users a week, though. If bots add so much load that you need to go optimise your website for them, then that's a bot problem not a website problem.

Yes yes, definitely people don’t know what they’re doing and not that they’re operating on a scale or problem you are not. Metabrainz cannot cache all of these links as most of them are hardly ever hit. Try to assume good intent.