I got mine the first day. You may want to try restarting the device. If that doesn't work, a factory reset may be another option.
I didn't do a factory reset. Then I updated to ICS and noticed a lot of lag. I did the factory reset and things are running much smoother. IMO, a factory reset should be required for any large update like this. I know it's a pain to have to set everything up again, but it's worth it for performance.
Hope you get your update soon.
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