I think i missunderstood you I thought you were arguing for modern web frameworks. Nothing wrong with replacing elments with js and not sending it as a request to a server I would do the same for stuff that doesn't need data from the server. If you are really worried about latency you could throw your code in a cloudflare worker but I don't think it matters that much average loading time of websites on desktop is 2.5 seconds . So it doesn't really matter if the server is on the other site of the world latency will not be the biggest factor.