What can I replace in my iPhone 4 to make it go faster?

Let me start with saying that I have a lot of experience with taking the iPhone apart and am familiar with most parts. Anyways, my phone has gotten progressively slower and slower, and I'm pretty sure that there has got to be a part to replace to make it faster (motherboard maybe?). I just haven't seen any questions like this so I have no clue.

You can't replace anything in your phone to make it go faster, its just not possible. The only thing you can do to help is do a factory reset and delete all your data and start fresh.

How many apps do you have? Try cleaning out the apps you don't really like and keep it down to your favorites. You can delete apps by holding your finger down on an app. Let go. It will start to shake. Click the X in the corner of the app to delete it. You'll need to press OK when it asks you if you are sure you want to delete.

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