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SHA-512 should be much faster than SHA-256 on AVX2-capable processors. Go's implementation is subpar; try OpenSSL instead. On Skylake, SHA-512 is about as fast as MD5 now -- https://bench.cr.yp.to/results-hash.html#amd64-skylake

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Yes true. OpenSSL version gives a great boost. Rather than SHA512 we ended up using Blake2b - https://github.com/minio/blake2b-simd (also optimized with SIMD instructions) internally for bit-rot verification in https://github.com/minio/minio

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