internet upload speed fast, Cyberduck upload speed extreme slow

[Bart Jitter]

Hi

I noticed a real big difference in upload (same file) speed between Cyberduck (ftp server) and Wordpress (browser): Cyberduck +-30Kb/sec versus Wordpress +-3Mb/sec

Also in upload speed between Cyberduck (ftp server) and internet speed test: Cyberduck +-30Kb/sec versus Internet Speed Test +-9Mb/sec

How is such big difference possible? Some settings? 

Really terrible to work (web development) in such a way. 

Internet speed test was done with: http://www.speedtest.net

Thanks for some tips.