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You're mixing applications with ciphers. The application has little impact; most of the work is in the cipher. If your CPU (and the CPU on the remote side) are not maxing out at 100%, then the cipher and the application are not your bottleneck. You are being bandwidth limited. In that case, you can add compression, to trade CPU for bandwidth:
sftp -C -o Cipher=blowfish user@host
In the end, you can only optimize a limited resource so much.