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sftp transfer speed is orders of magnitude slower than Transmit or CLI sftp command
sftp transfer speed is *very* slow. Between ExpanDrive and programs like sftp and Transmit, the speed difference over a local LAN is orders of magnitude. Files that transfer at 10-20MB/s using Transmit's SFTP and take 10-20 seconds takes minutes using ExpanDrive.
The example images are screenshots of ExpanDrive and Transmit in action copying the same file across a local Gigabit LAN connection.
The example images are screenshots of ExpanDrive and Transmit in action copying the same file across a local Gigabit LAN connection.
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The more people who report this problem, the more it gets noticed.
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Inappropriate?This is a problem we're keenly aware of, and we are working on some changes that should improve the throughput of SFTPFS greatly.
Let me add, however, that there are some basic technological reasons why no filesystem interface (including ours!) can ever be quite as fast as a dedicated file-transfer client for end-to-end copies of a large file. A file-transfer program knows in advance that it is going to move the whole file from start to finish, whereas when the Finder is doing the copy, all the filesystem knows about is which pieces of the file the system requests or provides at any given moment. This is an intrinsic limitation of the system interface. With aggressive caching and read-ahead, we can shrink the gap, but it will always be there.
That said, we can and will make it go quite a bit faster in the near future, so don't give up hope just yet. :-)
1 person says
this solves the problem
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Inappropriate?I noticed this too. I also tried a cmd-line cp from /Volumes which was somewhat faster than a Finder copy, it was still about an order of magnitude slower than Transmit.
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