All tests were run on plugged in laptops running macOS Ventura, in February 2023.
Time to run Ruby test suite
Intel i9 2.4ghz 8 core with 32gb
M1 Max with 64gb
M2 Max with 64gb
I confirmed that the time required to run this test suite (which uses Postgres 11 underneath Rails) remained within 10% of the given values across multiple runs. If anybody cares, leave a comment, I might try to run more types of performance comparisons while I still have the three laptops set up with the same set of tools and same OS.