After upgrading to 4.0 my phone was pretty laggy. Some apps were worse than others. Maps was almost useless, would hang for 20 seconds while not responding to

After upgrading to 4.0 my phone was pretty laggy. Some apps were worse than others. Maps was almost useless, would hang for 20 seconds while not responding to touches. However, 4.0.1 seems to have fixed most of the lag issues. In fact, I think 4.0.1 runs better than the 3.2 I had before upgrading.