if you have to do additional template fetching via follow-up async requests, sure. but if you serve the js & js-parsed/executed template in the initial request, then the only difference would be a synchronous reflow/paint for js (white page flash) vs streamed/incremental reflow/repaint.

completely disabling scripting [rather that just disabling third-party script injection] is not a pleasant experience, even for the technical crowd. i already reluctantly have to whitelist CDNs which can track me across the internet.