Ok.... First of all, your CPU has a lot of room for overclocking (Google this term, as It would take me far too long to explain this term fully).
Overclocking is something I do without any fear, but you need to know how. This is something you can learn just by visiting many websites that talk about this matter.
If your PC gets very loud, its either a poor cooling solution or perhaps the cooling is not sufficient.
From your answer I assume you dont know much about computers (how to change coolers, how to overclock, and similar things enthusiasts do).
If you have free time, on the internet you will find all the information you need, but always compare the information from at least 3 different sources to make sure the sites did not miss anything.
If you can add a budget cooler to your CPU (Not sure now what one, but you could ask in toms hardware forum, in coolers department or CPU department), overcloking should increase your CPU performance by quite a lot.
Priority can be asigned by alt-tabbing out of the game, pressing Ctrl+Alt+Surp, then choose task manager, Performance tab, right click on the game and choose set priority (It lets you choose different priority settings for the CPU).
As a Final Note, one things that almost every site online forgets to mention is Compatibility.
Most sites that talk about coolers, or any other hardware assume you know that not all components are compatible and they forget to metion it.
So make sure you check that (not only compatible with the CPU, but with the motherboard, and the case. IF unsure, ask at forums).