引用 mode z

Purpose
On-the-Fly Compression

Benefit
Faster data transfers!

Directory listing, which is text, can be highly compressed with zlib thus boosting the server and client network speed and reactivity.

Webmasters and server administrators will see an increase in prodUCtivity : transfers of html, scripts or large logfiles (which are text) no longer needs to be zipped before being sent via ftp and should generally eXPerience a 3-4 times gain in data transfers.

For example, a 60MB log file can turn into a 5MB data exchange when transferred with MODE Z enabled.

Depending on the file content, you will see different results.

Typical gains :
- Text files : ~15-20% of original size
- HTML files : ~25-30% of original size
- Media, Video, Sound : ~90-95% of original size

Note : Already compressed documents with Zip, Rar, Ace etc. will see virtually no gain at all.

Server Support
ShareIt, Gene6 FTP Server, RaidenFTPd, Servu 5.x, Blackmoon FTP Server, FileZilla Server

（出处：部落中国）

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