> I'm no authority here, but I believe a large (major?) part of the Cgo 
overhead is caused by scheduling overhead. As I understand it, a C function 
call is non-preemptible and the Go runtime don't know whether the call will 
block. 

But that part would be handled by the C-compiler-that-knows-Go inserting 
the pre-emption points just like the Go compiler does into the generated 
code. Or the same checks for blocking.

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