When I have see that a webpage has 20 or more scripts attached to it from domains differing from the one website I am visiting, I do by default assume they are tracking scripts from advertisers or facebook or similar ilk.

If a website needs scripts, I expect the website to serve it from a domain which belongs to it. For most sites I visit there are at least 30, sometimes 50 scripts from various sites and domains trying to track me, slowing down my browsing experience, and sucking up my systems ram.

Disabling those causes massive speed-ups. Plus it protects my privacy.

Install ScriptNo in Chrome (or similar for Firefox). You will be shocked by the difference. And you will be shocked by the massive script-abuse currently on the net.

And no, I will not wade through that long list for each and every page I visit, to whitelist whatever CDN you have decided to put in the same trustworthyness-group as doubleclick.net.

If your site breaks with those scripts blocked, I leave.