Recently, I stumbled upon a Reddit thread on font rendering in Emacs on macOS. I figured many users might be unaware of simple trick for crisper fonts:
defaults write org.gnu.Emacs AppleFontSmoothing -int 0
After running this command, restart Emacs to see the effect.
If you’re not satisfied with the result, you can easily revert to the default settings by running:
defaults delete org.gnu.Emacs AppleFontSmoothing
Remember to restart Emacs after making changes again.