All tweaks vary by device. What I have running on my S4 may not run well on yours. Yo have to find what works for you.
Also, we have no idea what firmware you are on. If you are on MF3, I personally suggest staying away from tweaks. Since there is no custom recoveries for MF3 here is no real way to fix anything that gets borked unless you can ADB and know exactly what got messed up. A tweak or mod can be very beneficial or can brick a device.
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Epic 4G Touch
If you can't follow the rules, I can't help but tell you how wrong you are.
I am the enforcer.