can you make it faster than C though please? (seriously) i think it might even happen by accident in some cases already though. the places where C can be beaten for performance are, in my experience, from design choices in the C standards, users not understanding or leveraging those things for performance and the architecture of the compilation-unit/link process.
things like the struct layout rules - instead of the compiler organising things to be optimal it follows those rules for memory layout, or the calling conventions - you often have to use funky extensions to get efficient function calls.
other things are the lack of ability to hint the compiler that e.g. mathematical structures underly types that can be leveraged for optimisation. that const or functional purity can be trusted... etc.