Hey thanks to the person who posted the tip on how to fix the lagging problem in 4.2. It was basically to go into the built-in recovery utility and clear the device cache. I did that and my tablet's speed and smoothness is back. I had mainly noticed a lag when changing from landscape to horizontal or vice versa. Since the update it had been taking an average of six seconds to rotate. But now it's back to about two seconds to rotate. Her was the post with the recommendation:
http://forums.androidcentral.com/showthread.php?p=2341252
http://forums.androidcentral.com/showthread.php?p=2341252