Button click automation with JS?

Question

JavaScript

Hello!
There is a site (not mine) where it was necessary to make auto-completion and auto-submission of the form. Wrote a custom script. Now, when you run the script, you can automatically fill out and submit the form.
Today I went to DevTools in the Network section and saw such a picture (attached to this question). Tell me what all these lines mean, I myself could not figure it out at all. We are talking about the inscriptions in the timing tab