Before we begin, we have to mention that benchmark results and real-life performance are two different things. Yet tech enthusiasts like to run synthetic tests on their hardware and software anyway, just to see what they are theoretically capable of.
At its root, the browser is based on the same WebKit version, and still has a limitation of 8 windows opened at once. However, the developer who performed the tests notes that the UI has been tweaked, and as a whole, the experience feels more streamlined.
So yeah, good news for iPhone and iPad web browsing. Now all we have to do is sit tight and wait patiently until iOS 6 is released, so we can experience the difference ourselves.
Safari on iOS 6 benchmark tests