Today I Learned

A Zero One initiative

Check if you are running arm64 or amd64 brew

With the switch to m1. Most people will still be running the amd64 version of brew, which will be going through a translation layer all the time.

Run 

which brew

If you get /opt/homebrew/bin/brew

Then you are using the correct arm version.

If you get /usr/local/bin/brew

You are still using the amd64 version.

You can follow the following if you want to switch.

https://earthly.dev/blog/homebrew-on-m1/