In tests performed by PhoneArena, Puffin consistently outperformed any other browser both on synthetic JavaScript speed tests as well as real world cold page loads.
Reading mode allows removing everything on a page but the content. It removes ads, styling and anything else that could get in the way of a comfortable reading experience.
You can open a page as a floating window, you can open as many floating windows as you need. The windows can be individually resized and positioned wherever you want. The window can float on top of other applications as well.