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How to use data compression
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Some FTP/FTPS servers support what is called MODE Z data compression
to reduce the amount of data that
is transmitted. Both the client and server compress data before sending and decompress data
when it is received.
Compression and decompression both use CPU time, but if transmission
speeds are slow, transfers can be sped up significantly, particularly
if text files are being transferred. A compression factor of 10x is not
unusual for text files. Media files are usually compressed
already (e.g. JPEG and MPEG) and there will be little or no benefit in
using compression. In fact with the added CPU time it may even be
detrimental.
An example of how to enable MODE Z compression is shown below. Compression is only actually used if supported by the server:
ftp.CompressionPreferred = true;