I wouldn't worry, Go is not as fast as everyone believes it to be, particularly for tasks like these, unlike C# - there's a reason Nethermind Ethereum client us

I wouldn't worry, Go is not as fast as everyone believes it to be, particularly for tasks like these, unlike C# - there's a reason Nethermind Ethereum client uses pure C# without ever having to touch C or ASM (the performance critical parts of Geth, another Ethereum client that uses Go, are implemented in C and Go's "asm" instead).