Not sure if C# can beat Go in real-life applications but C# has advanced features that can contribute to performance:

- JIT and runtime optimizations

- AOT compilation if you want it (probably contends Go's native compiled code?)

- Access to raw pointers that lets you do things like pinning things in memory and intervening with normal GC

- hardware intrinsics for SIMD support

C# comes with some serious performance knobs if you're really committed to writing performant code.