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Software is slow because of bad design, not slow languages
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Recently had to develop a Python project, the tests took at least ten seconds to start each single time. This is while I made over a hundred tests for my module and re-ran them after every change.
Python is dog slow, but if your tests are taking 10 seconds to start (not even run!), then something is catastrophically wrong with your setup. For comparison, for one of my projects, it takes a total of 12 seconds to run nox on a clean slate, which involves setting up venvs for five major versions of Python, installing the package and its dependencies in each, and finally running the 1500 test test-suite five times