Apple has released a total of 4 iPhones so far, the original iPhone, iPhone 3G, iPhone 3GS and the latest iPhone 4. Performance is obviously improved with claims of “fastest iPhone yet” each time a new iPhone is announced.

So how much faster can it get? To make it easier, there’s a video demonstrating all 4 iPhones running apps such as Plants vs Zombie, Google Earth, Seadragon and Safari. As seen on the screenshot above, the latest iPhone 4 boasts up to 3X faster loading time on apps such as Plants and Zombie.

Head after the jump to watch the full video.

iPhone 2G/3G/3GS/4 Speed Comparison from Mike Hellers on Vimeo.

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	iPhone, Mobile Devices, Video
	apple, iPhone, iphone 2G, iPhone 3G, iPhone 3GS, iPhone 4, iPhone Speed Comparison, Video