Don't know why this was downvoted, it is relevant. That's the main reason why hacks like PJAX/turbolinks were invented in the first place, not having to reparse

Don't know why this was downvoted, it is relevant. That's the main reason why hacks like PJAX/turbolinks were invented in the first place, not having to reparse the same JS and CSS for every page change has a noticeable impact in perceived performance.