Privoxy is awesome.
I was using it for a while in place of AdBlock because of the memory issues associated with the Chrome AdBlock extension (Gmail would regularly and quickly balloon to 1-1.5GB of memory usage).
I recently moved over to µBlock to give it a shot, and pages seem to load faster than through Privoxy (plus I can use QUIC on Google services since there's no proxy), but I haven't had an opportunity yet to test the memory implications.