What are the techniques used in watch that cause significant performance boost over starting over manually

[rluvaton]

Hey, I love this test runner (even though I'm from the Node.js test_runner team 😉 )

I'm trying to improve the performance of test startup time when not using watch.

How watch make the test start faster?

• Is it because of already finding the test files?
• use already compiled code?
• anything else?

I want to add a local cache maybe so the test starts faster, it takes 8s for my test to run and I want to improve the performance after the first run to help in debugging