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)
Related Forum: iPhone
Top Rated Comments
The real difference will be when devs write apps specifically for the iPhone 4S to make use of the better hardware.
Which in my opinion is the most important area.