Need help with my Samsung Galaxy S3

[Toxic Dunker]

Can someone help with explaining tricks and tips to help speed up my device on a whole.
my device has been running slow for a while now and has caused a few problems for me since I'm a online gamer and use my phone a lot.

Cheers

 

[Rukbat]

Clear the system cache. Clear each game's cache.

 

[Toxic Dunker]

I've tried that Rukbat, didn't seem to speed it up any.