Welcome back! Sometimes Safari stores too much history and cookies, that you need to clear history and cookies. Also check how many apps you have on your shelf (double click home). Close some of those apps. You have upgraded to the iOS that came out earlier March 2012?
If all else fails, reset your iPad by pressing down on your sleep and home buttons until the Apple logo appears. Or reboot your iPad by pressing your sleep button until you get the slider to proceed to shut down.