Hi, I was just prompted to install the latest 1.4 update from Apple that improves "graphics", external display, and thunderbolt compatibility according to the release notes. Right after the restart I was offered an EFI firmware update as well. Did that and now my MBP 15" (2011) feels faster and I don't see the screen artifacts I used to see some times while working. Anyone knows what else was fixed in the update? How did it work for you?