My MPB can't play 1080p/60fps videos on youtube. Even when pre-loaded and with everything but Firefox closed the video are extremely choppy, but the sound is totally clear and 720p/60fps plays just fine. There are no new drivers for the card available for mac, and I have recently upgraded to Yosemite in the hopes to fix this issue, but no luck there. The specs are... Processor 2.66 GHz Intel Core 2 Duo Memory 4 GB 1067 MHz DDR3 Graphics NVIDIA GeForce 9400M 256 MB Is there anything I can do to play 1080p/60fps videos? Or is this simply outside the hardware's ability? I'm very flexible in what I would be willing to do software-wise with my MBP, I basically use it only for MS Office, Firefox, and the Photos app (no editing, just slideshows). Firefox would also gobble up all of the active memory if left open while the macbook was lid-closed and sleeping (cold to the touch). I had to restart Firefox every time I reopened the macbook. It's not the largest inconvenience, but I thought it might be related if there was a video software problem. By the way, my only current login item is iTunes helper.