How is this useful? You're adding extra work to everyone's life by requiring them to read everyone else's code, learn which tests are slow, and remember not to run those tests!

I have a lot of slow tests in my current project. I tag them with an annotation and then you can automatically skip all the slow tests for a quick run.

So people just run `run_test --fast` and that's it. If I add ten new slow tests, it all goes off automatically - no comments needed.