Make my iPod touch 4th gen faster

Hello Apple Core!

I have noticed of late (i.e. after installing iOS 6) that my iPod touch has become noticeably slower and laggy. I type on a keyboard and it takes a few seconds for the characters to appear, I tap an app and it takes some time to load and other such quirks. What could be the reason? It was very zippy when it had iOS 4.3, developed a slight lag in iOS 5 and not it has become very laggy. How do I make it zippy again? Any ideas?