Okay so bought a MBA off ebay and sent it in to apple and they repaired a few things to make it 100% functional. I got it today and I was using skype and I am really glitchey, and watching videos on mtv they are really slow. So my question is how do I boost the performance and can I send my MBA into apple so they can upgrade the ram to 4gb since the MBA ram is not user upgradeable?