Use transfer compression (ZLIB) to improve speeds

[robinrodricks]

The MODE Z command allows for ZLIB transfer compression of file listings and upload/download. Use this to reduce the data transfered and increase the speed of transfer. This command has been already adopted by many popular FTP servers.

Resulting savings due to the compression:

• Text files : ~15-20% of original size
• HTML files : ~25-30% of original size
• Audio/video : ~90-95% of original size

[jblacker]

I think it would be awesome if we used this default upon detecting the feature is available.

[nvivo]

Was looking for this. Any idea when it will come out?

[robinrodricks]

@nvivo Why do you need this?

[nvivo]

I use this lib as part of a deployment tool, and I frequently need to send new files to dozens of servers over the internet. The average compression for my files on fastest zip compression is around 37% of the original size, so it would help me make these deploys faster.

[robinrodricks]

Added to the bucket list. We will pick this up as and when we have free time. Comment on this issue if you want us to prioritize it. Thanks!