This is a good point, but I would counter, perceived speed of rendering from a user perspective is more important than time to interact with the app/site (a reasonable time to interact is however very important.
Good load order and only loading in the content and JS above the fold initially helps a ton.
JS frameworks are huge and I am still saddened that proper tree shaking and optimization got left by the way side in how the modern web has evolved.
I worked with google closure in advanced modes and the closure components for a few years and the compiler was absolutely astounding (and the components designed with the compiler in mind) in code splitting, tree shaking and minimization.
Good load order and only loading in the content and JS above the fold initially helps a ton.
JS frameworks are huge and I am still saddened that proper tree shaking and optimization got left by the way side in how the modern web has evolved. I worked with google closure in advanced modes and the closure components for a few years and the compiler was absolutely astounding (and the components designed with the compiler in mind) in code splitting, tree shaking and minimization.