Nitter might not require Javascript to run, but it's everything but fast.

Every page that's not cached takes several seconds to generate. It's not much better to show a white page for seconds than it is to show a skeleton page and then load the data using javascript.

Also they have taken the decision to proxify all images/avatars through their own servers. Why? And if you do that, at least set appropriate cache headers! Every time I visit a page inside Nitter every single image loads again even if I've seen it already.