No they said they "We have spent a huge amount of time optimizing around D3D..." In other words he was saying that they are far more accustomed to D3D and basically have learned the ropes using it. He didn't say that they had optimized the code for the demo and considering they were likely paid by AMD... grain of salt. I mean I fully expect it to work better but I'm sure there is some fluff here.They said that a crappy implementation of Mantle code still kicks the crap out of well optimized DX11 code. These people specialize in DX11 and they can slap together random crap in Mantle and make it work better.They also mentioned that when they try to thread their code too much, the driver devs tell them to back off because they're choking the driver threads. Yet the CPUs are mostly idle.The whole DX/OpenGL paradigm is so bad for modern computers that driver engineers are telling programmers to use less CPU when a CPU is almost entirely idle. The system is broken, it needs to be replaced.chicofehr :Mantle main problem is its going to take some time for developers to optimize their own software to utilize it to its full potential. Most developers have been using DX for very long and using a new api takes time to learn. I am sure the performance will be way better once they get a hang of it.