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When you run Windows using Boot Camp, you're literally running Windows natively on your computer's hardware. So your games are able to fully access and use the CPU and video card at full speed.
Under Parallels, your games don't get full CPU performance, and they can only access a virtual video card. The specs page for Parallels specifically says that 3D acceleration is not supported. So running 3D games under Parallels basically isn't an option.