opt-out of ads speeds up WWWeb somewhat !

http://www.youronlinechoices.com/de/praferenzmanagement/
https://www.optimizely.com/legal/opt-out/

just disable all domains there so you get 130+ opt-out cookies.

with these in place and google analytics opt-out add-on Websurfing speeds up noticeably even with uBlock in place.

save + restore (or protect from pristine profile) the opt-out cookies for fast web.