All tests were run on plugged in laptops running macOS Ventura, in February 2023.

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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.