slow file transfer rate on ubuntu and kde

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http://askubuntu.com – I have ubuntu 12.04 and kde. I notice that a file transfer on a pen drive in windows with the software ExtremeCopy goes to 30/32 MB/s. Here in ubuntu the transfer on the same pen drive is at 10/14 MB/s. Obviously I use dolphin as file manager but maybe it's a problem with transfer file manager I don't know. I also downloaded krusader file manager but a file transfer is still done by kde (in the system tray icon) so it's still slow. How can I solve it? Anything to increase that speed? Thanks (HowTos)