Demonstrates the affects of Crystal, "an advert & tracking blocker", that uses the content blocking feature of iOS 9.
From Crystals website:
On average, pages loaded 3.9x faster with Crystal and used 53% less bandwidth. Just by having Crystal installed, I saved a total of 70 seconds and 35MB of data on these 10 pages.
The Next Web does a fantastic job of demonstrating this by loading sites with and without Crystal side by side.
With such fantastic results by just installing and app people will use this. With a bit of luck this will lead to a cutback in heavy ads and tracking scripts.