My DX has been getting progressively slower since I got it. Is there anything I can do to clean it up a bit? I don't have many apps but I'm sure theres some useless files somewhere that are slowing it down.
If you don't see an improvement then more then likely you do have an app that's hogging resources. About the only thing you can do at that point is a factory data reset. You won't lose your paid apps, you will lose your data and unpaid apps. After it's done you'll need to sign into Google, and what ever else you need to sign into. Then slowly start adding the apps back in. Hopefully you can find the app that is giving you problems.
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If you are rooted get the app called cache cleaner. If you are not rooted there is an app call Quick systems info pro. Once you get it go to your widgets and you will see quick cache cleaner. get that and it will clear all your cache with one click.