My younger brother's PC shut off as the power went out at his house (yes, he should have been using a surge protector). After that, his games started running really slow/choppy/laggy. Loading a map in Sim City would take up to 10 minutes. So far, we have tried replacing the power supply, upgrading the video card, and replacing the HD with an SSD. It seems to have gotten slightly little better, but it's still pretty bad. Chipset and video drivers are installed and are up to date. He uses Comcast internet and downloads at about 2-2.5MBps (don't know the Mbps). Everything else seems to run fine. The only thing left are the CPU and memory, could either of these be the problem?