Why sftp is slow

That said, 40 seconds does seem very very long. If you change just one page mark changed how long does it take to publish? Takes me on average 4 seconds between asking to publish a page and the files actually starting to be published.

And I have a very modest internet connection. It takes 40 seconds to beginn the transfer, another 40 seconds to set up a second connection and ten seconds to upload the data. Hopefully someone else can help here. It is limited by the encryption speed and several layers of data copying and processing during SSH tunneling. Compare this with an FTP transfer, where the data is sent over a dedicated socket unaltered, and SFTP file transfer, where each chunk of data is wrapped several times and unwrapped back on the other side.

Different encryption algorithms have different speeds. This is caused by the number of calculations needed to encrypt the block and by the block size.

Encryption algorithms can be enabled and disabled using the EncryptionAlgorithms property. Note that in. They're chunked with the client opening a remote file and requesting it in chunks no larger than 32K at a time. After each read request, the server replies with the chunk and the client issues another. When you request a chunk beyond the end of file, you either get a partial chunk or a response from the server indicating you've reached the end.

That's how a download is done. Some SFTP client make "x" requests at a time making the transfer faster while some sftp client issues one request at a time. This is how they're attaining faster transfer speeds. Serv-U is constantly retrieving and sending data to the client reducing the amount of time that's spent with no data being sent. The trick in this method is that chunks of data may arrive out of order. So the client must perform writes to the file according to the window of the file that the original request corresponds to.

If you are looking for faster transfer speed, it is best to use FTPS which is also secured. Disclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties. Your organization should internally review and assess to what extent, if any, such custom scripts or recommendations will be incorporated into your environment.

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One of the problems is that SFTP is a terrible protocol to being with. It sends unnecessary confirmation packets for each transfer packet, which makes the whole protocol dependent on the connection latency instead of the connection speed. It can never operate at anything close to the line speed. SCP is a completely different protocol. That's not a defense of DOpus, just an explanation. That's atrocious. Yours Jerry.