How to get more performance out of my iphone 4s?

I've disabled spotlight search, i reduced contrast and motion, disabled app background refresh, close background processes and everything else that was recommended to increase performance. My iphone does run well doing ordinary tasks such as web browsing and such but apps seem to run slow. I want to play call of duty strile team but the game runs pretty slow on my device. I'm running ios 7.1. Is there any ways to get more performance out of games like this? I was gonna overclock my device using my root files but because i update to 7.1, a jailbreak is no longer supported.

Overclocking an iPhone, good luck on that!

There's nothing really you can with your phone, apart from factory restoring it and seeing what happens.

The hardware isn't anything close to 5C or 5S, so it will be a little slower. 5S is also 64 bit.