So I was using my rMBP with 16gb of ram today as usual. Suddenly, the graphic performance just dropped. I got the gfx card status. My machine can't even run a game like cultris 2 with over 30fps when using 650m card. I could play csgo with all high in 100fps this morning. After several reboots, I restored my time machine backup from yesterday but the issue is still here It's in the newest version of osx and I didn't change any setting or install anything today. Should I bring it to apple store or do a couple more tests? Is there anyway to fix this ****? Thanks.