Make sure you have a sufficiently powerful machine that isn't being overtaxed during SFTP file transfers (high CPU utilization).Most organizations run Linux servers for their enterprise databases and applications. How powerful is the server machine? Encryption with SFTP is very intensive.If the link you are on has a high degree of latency then that is going to be a problem for fast transfers. Network latency will drastically affect SFTP.Try several different SFTP clients and see if you get different results. The SFTP client you use can make a big difference.
We've had users report solving extremely slow SFTP file transfers by modifying their firewall rules. Is there a firewall or network device inspecting or throttling SSH2 traffic on your network? That might be slowing things down.The following are items to check when trying to maximize SFTP transfer speeds: However, it is still possible to get a data transfer rate of several MB/s between client and server using SFTP if the right network conditions are present. The flexibility that SSH2 provides for securely packaging and transferring almost any type of data also contributes a great deal of additional complexity and overhead to the protocol. SSH2 was designed as a replacement for Telnet and other insecure remote shells, not for very high speed communications. This increased susceptibility is due to the extra data handshaking involved with every packet sent between the client and server, and with the additional complexity inherent in decoding an SSH2 packet.
SFTP runs over SSH2 and is much more susceptible to network latency and client and server machine resource constraints.
Encryption will slow FTP down, but not nearly to the level of SFTP. FTP is a very lean and comparatively simple protocol with almost no data transfer overhead, and the protocol was specifically designed for transferring files quickly. The reason for the difference is that there is a lot of additional packet, encryption and handshaking overhead inherent in the SSH2 protocol that FTP doesn't have to worry about. SFTP will almost always be significantly slower than FTP or FTPS (usually by several orders of magnitude).
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