If you only care about throughput, just fetch the data and read should be the same speed as triple replicated. For writing, triple-rep has to write 2x as much

If you only care about throughput, just fetch the data and read should be the same speed as triple replicated. For writing, triple-rep has to write 2x as much data or more, so it's going to be slower unless your CPUs are horribly slow compared to your drives.