How do u get low ping?

i am looking for a guide on how to speed up your computer basically :/ .
I use GameBooster(which stops all unnecessary processes) and i plug in the ether-cable thing into the router and have my wireless internet on too. But i always end up with 70 Ping with aroun 50-80fps and sometimes bounces to 90-100 (but only when i die in S&D games and im spectating).
I was wondering if some1 could make a guide on how to Increase your Fps in crossfire to around 200fps.
Just tell me the kind of processer i need, graphic card, ect.
Thx in Advance?
[I just got a new computer i am about to install crossfire on it this is what it has]
-Inter(R)Core(TM) i5-2400S
-CPU @ 2.50GHz
-RAM (6.00)
-Intel(R) HD Graphics

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