Note app is really slow on my iPhone 4?

Ok so on my iPhone 4 notes I write stories I currently working on one right now but when I Type it responds slow and that, I asked my friends for help and they say shut down and wait so I did that but it was still slow when I was typing in the notes, I turned on the ringer switch up so the keyboard click noise would play and it would write better but nothing, I'm about to throw my Phone across the wall what should I do and please explain in steps thanks

Restore it

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