How much faster would my C program be if

I skipped all the function bullshit and just used main() for everything and used goto in an BASIC line number fashion?

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It's like what happened when the macbook air came out with flash-only drives. Performance was notably worse. Why?

Because current filesystems had decades of ``optimized cruft'' for spinning magnetic hard drives. So, basically the same story for your code and clang/gcc.

muh branch prediction