Iphone 5 has major frame rate drops in the OS?

I have a white iPhone 5 16 GB. It's been a great phone, but over the last 2-3 weeks I h vas noticed that the OS seems to have dropped from a solid 40 FPS to 10-15. I'm running on the latest IOS 7.1.1 from Apple. My dad has an iPhone 4 running on the same IOS version yet his phone is much faster while scrolling in the settings app and doing day to day tasks. My mom has an iPhone 5 black version, running the first release of IOS 7. She has about 2MB of space left on her phone yet it runs at 60+ FPS. My phone has 2.6GB of open space. I downloaded an app that removes junk and releases free RAM, this didn't change anything.

Why is my phone having FPS issues?

Mine is also like that but I don't know who to fix it

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