In the talk you say that you reduced JS and therefore lowered TTI and saw more clicks on the signup button. Is it possible that you are just _tracking_ more clicks, but the total is the same?
Does it really matter how much JS there is if it's loaded after HTML and the user can already move to the sign up step without it?
Does it really matter how much JS there is if it's loaded after HTML and the user can already move to the sign up step without it?