I frequent one forum only through a self-hosted custom proxy. This proxy downloads the requested page HTML, parses the DOM, strips out scripts and other non-content, and performs extensive node operations of searching and copying and link-rewriting and insertion of my own JS and CSS, all in plain dumb unoptimized PHP.

Even with all of this extra work and indirection, loading and navigating pages through the proxy is still much faster than accessing the site directly.