David Kimura PRO said over 1 year ago on A Rubyist's Apple M1 Review :
  Yes, I've experienced that as well. However, using the arm64 binary of ruby right now isn't recommended. I've also found that doing the alternative install isn't recommended right now since there are a lot of things still broken. You can get by with the alternative install if you are not needing to do any Rails work, but as soon as you do, you'll run into issues. I would go with the intel arch install of homebrew like seen in the video. At least until there is a more stable version of homebrew and the gems are stable for the arm64 arch.