Review: Apple iPhone 4S for AT&T
The iPhone 4S has a dual-core A5 processor from Apple. It is fast as blazes. I don't know what kind of pixi dust Apple sprinkled into the processor, but it is hella fast. Every action is instant. Every screen transition, every menu action, every scrolling action is smooth, fast, and beautiful.
Why is the processor meaningful? Syncing huge amounts of content to the iPhone 4S is brisker than the iPhone 4. Playing hard-hitting games such as Infiniti Blade were fast, smooth, and free of any sort of performance problems. I was able to load up iMovie and edit movies with no problem. I also used some significant sound-processing apps such as TouchWiz and SampleWiz and was able to create new sounds without taxing the processor.
The A5 chip is faster than the A4 chip by a significant margin.