Google's Chrome for iOS Uses Apple's Engine - Ina Fried - Mobile - AllThingsD

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"That’s a lot of jargon, but it boils down to this: Chrome for iOS will be slow — significantly slower at many tasks than Apple’s built-in browser.
This isn’t unique to Chrome. All browsers are required to use Apple’s browser engine, whether it is Dolphin or Yahoo Axis or any number of other third-party browsers."

Google's Chrome for iOS Uses Apple's Engine - Ina Fried - Mobile - AllThingsD