It's not just about overhead/performance. cgo-free means no need to set up a cross-compiler if targeting other devices. Just "go build" with the right GOARCH and GOOS will let you compile a binary that will run on most devices.
The following go flags let you build statically-linked cgo binaries, provided that all the C libraries that you're using support static linking and don't call the NSS functions in glibc:
