https://pythonspeed.com/articles/speed-unit-tests/
Unit testing your code’s performance, part 2: Catching speed changes
by Itamar Turner-Trauring
Last updated 26 Feb 2026, originally created 24 Feb 2026
"...what you really want is to get some sense of whether performance changed much earlier in the process, giving you immediate feedback when you’re running tests locally. Since a reliable benchmark environment is hard, switching to a test might allow for an early warning."