I just got the 2.4ghz refurbished aluminum MacBook and for some reason WoW runs pretty smooth, around 45fps, when I start playing, but as I continue playing it just bogs down my whole computer. I start to get around 15-20fps, and even Safari seems slow. I don't have a ton of apps open either, just WoW and Safari usually. Anyone know what could be wrong, maybe because it's refurbished?