Stephen Fry once suggested pronouncing 'www' as 'wuh wuh wuh', taking around a third the time to say as the usual pronunciation. A pity it didn't catch on.
I've heard it pronounced "dub dub dub" for similar speed improvement
I first heard that 20 years ago and thought it was a genius hack.
I typically drop the middle syllable to get "dub-yew dub-yew dub-yew"; not as fast but no one seems to realize what I did and they just hear the full name.
This option has the advantage that 'dub dub dub dot' is fun to say.
www is useless anyway as you are already choosing to connect to the web by using the HTTP(S) protocol.