YouTube user Eurosausage posts a comparison video highlighting how much faster the iPhone 4S is than the iPhone 4 at launching apps.
While app launching is a basic task that doesn't show off high-performance graphics and other capabilities, it is one of the most common tasks initiated by users that forces users to wait for the system. The video offers comparison of a significant number of apps, giving a good picture of the everyday performance improvements users can expect in upgrading from the iPhone 4 to the iPhone 4S.
(via @wcontemporary)
Top Rated Comments
The real difference will be when devs write apps specifically for the iPhone 4S to make use of the better hardware.
Only major difference I saw was browser speed
Which in my opinion is the most important area.