Simplicity is the Answer
Simplicity is the answer to the question: "Why do I have to wait for my browser to reload a page that I have only just visited when I push the back button". The answer is: you don't. Simplicity buffers the last 5 pages you have visited, fully rendered, in memory and they are simply switched back onto the screen as you navigate back and forward.
Use three finger swipes left and right to navigate back and forward in your history or up and down to move between tabs. A four finger tap switches into and out of full screen mode. I've rounded out these key features with tabs, bookmarks and history make it the browser I use on my iPad every day.
If you like browsing speed on your iPad, Simplicity is the answer.