Update: I've looked through the support thread for that mod, and it seems like minifying HTML has some potentially very serious issues (BBCode can break, UI.X styles might not work with minified HTML).
Since I have still not seen any data showing that you save a statistically significant amount of loading time vs. the additional time-to-first-byte such a mod would cause, I'll close this request.
If you have any data that shows there is a statistically significant gain to implementing this functionality, feel free to re-open it