★ Safari Content Blocker, Before and After
daringfireball.net/2015/07/safari_content_blocker_imore
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
It’s not just the download size, long initial page load time, and the ads that cover valuable screen real estate as fixed elements. The fact that these JavaScript trackers hit the network for a full-minute after the page has completed loaded is downright criminal. Advertising should have minimal effect on page load times and device battery life. Advertising should be respectful of the user’s time, attention, and battery life. The industry has gluttonously gone the other way. iMore is not the exception — they’re the norm. 10+ MB page sizes, minute-long network access, third-party networks tracking you across unrelated websites — those things are all par for the course today, even when serving pages to mobile devices. Even on a site like iMore, staffed by good people who truly have deep respect for their readers.