Apple released the latest version of its mobile operating system two weeks ago, boasting 25 million installs within the first week.

In addition to over 200 new features, iOS 5 came with the promise of enhanced speed. Just how much faster is it? When it comes to mobile Web browsing, iOS 5 loads pages slightly more than twice as fast as its predecessor, iOS 4.

This is according to a side-by-side test of 3,000 Web apps performed by New Relic, who provided us with the infographic below. They loaded those sites using Safari 5.1 on iOS 5 and compared the results to what they saw when using Safari 5.0 on iOS 4.

According to these tests, it would appear that iOS 5 is substantially faster than the previous version, and is most likely worth the upgrade for most users. The new OS upgrade is available for either version of the iPad, the iPhone 4 and 3GS (it comes installed on the new 4S) and new iPod Touch devices.