I saw it noted in a few video reviews that the "return to start screen tiles" animation is a bit stuttery, and the handset I received is the same. Overall there's hardly any *major* lag but that stutter coming back to the start screen is a tad annoying.
*NB* that handset went back to Microsoft with a screen fault and i'm awaiting a replacement due tomorrow. I doubt there will be any change in that stutter.
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