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By using copyBuffer we avoid a buffer allocation for each block we hash, and by allocating space for the hashes up front we get one large backing array instead of a small one for each block. For a 17 MiB file this makes quite a difference in the amount of memory allocated: benchmark old ns/op new ns/op delta BenchmarkHashFile-8 102045110 100459158 -1.55% benchmark old allocs new allocs delta BenchmarkHashFile-8 415 144 -65.30% benchmark old bytes new bytes delta BenchmarkHashFile-8 4504296 48104 -98.93%