Overall, the new iPad (dubbed "Retina iPad" in Sencha's test results) was somewhat slower in six of the 9 SunSpider tests. In the seven V8 tests, the new iPad general matched the iPad 2, but both lagged the Motorola tablet.
For most Web browsing, Bansod says, users of the new iPad won't see any problems. But there is a noticeable difference between the two iPads when it comes to drawing complex Web pages. For example, the new iPad was visibly loading new tiles at the bottom of one sample page as the page was being scrolled, something that rarely occurs with the iPad 2, according to Bansod.
He speculates that one reason for the performance plateau in the new iPad is that while Apple added the quad-core graphics processor and more memory, it didn't make the memory faster. That would mean, he says, that pumping images and other graphic assets into the GPU is taking more time and bandwidth "than the device can handle in real time."
John Cox covers wireless networking and mobile computing for Network World.
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