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More proof that Ice Cream Sandwich is indeed baked into the device. The One X has been announced as being a quad-core handset. However, HTC notes that it actually has a 5th core for improving energy/resource consumption and efficiency making the device a 4+1 core system. You know those apps that run in the background and gradually consume your battery? It's now powered by that extra core, so the other four can focus on the more important things.
We've yet to spend enough time with the One X to fully cover its overall performance but based on our short date with it, we can say that it's among the fastest and most responsive devices we've held, thanks to its Tegra 3 and 1GB RAM combo. So far, there were no lags and freezes during UI navigation and screen transitions.