How to speed up my Iphone 3gs 8gb?

I have an Iphone 3gs that is 8gb, I used up about 5 of the 8gb, and it is extremely slow! I was wondering how to speed it up! It didn't start going slow until after the last Apple Update in Januarary 2013!
Also is their any Prepaid gsm plans that is cheap with a good amount of data, and also unlimited texting? And by cheap I mean not over $50.00 per month.

What firmware r u on?
you can use straight talk unlinited everything for $45 or so per month

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