scp: transfer speed & compression

With compression:

$ time scp -c arcfour -C somefile somehost:/somewhere 

real    47m30.974s
user    46m18.974s
sys     1m4.040s

Without compression:

$ time scp -c arcfour  somefile somehost:/somewhere 
real    10m41.195s
user    2m41.142s
sys     0m51.611s

details of somefile:

$ file somefile 
somefile: MySQL MISAM compressed data file Version 1

Gist: if a file is already compressed, scp-ing with -C (compression) rightly slows down the transfer.