Is There a Key to Fast Testing?

Fast testing is a combination of property based testing with like API building and API testing. It's something I've always wanted to experiment with, but didn't know if it existed until recently. The name comes from the fact that you can on Google it fast testing. Yeah, that makes a lot of sense. We kind of deviate a little bit from my building APIs, but I think there's an overlap there because at the end of the day, this is also about how does my system behave?