CGO overhead of reading file use far too big CPU on windows

[Jorropo]

This was while doing a parallel merkledag traversal while doing GC.

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[Jorropo]

Found with @Arlodotexe

[Jorropo]

Go just use cgo to call into dlls when using syscall on windows. Sadly I don't think there is much we can do except say windows sucks pls use linux :rofl:.