在「An hour with Safari Content Blocker in iOS 9」這邊提到了「An hour with Safari Content Blocker in iOS 9」這篇文章。
文章裡提到:
They have super tiny 'close' buttons that are near impossible to hit, they follow you as you scroll and there is a slow loading full page interstitial that loads on every page refresh. Urgh! Anyway...
在這兩張圖 (Before & After) 說明了很多效果:


而網頁讀取速度從 11 秒變成 2 秒...
蘋果在 WWDC 2015 上的說明則可以在「Safari Extensibility: Content Blocking and Shared Links」這邊看影片。