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If you experience some lag, my first advice would be to install the GCMH package. It basically changes the garbage-collection rules to ensure that most garbage collection will happen in small bouts while Emacs is idle. After installing it I've never had my Emacs lag on me. This wouldn't address the retina-display issues you mentioned, but I've never experienced those with emacs-plus.
There are some issues with the feature on MacOS: see the discussion I started over at emacs-plus for a more detailed look.
You might benefit from tangling those brew commands in your run-book to a Brewfile. Then you can just brew bundle and it’ll install everything for you on a new system. https://github.com/Homebrew/homebrew-bundle