ciao longline

Why is my File Transfer so slow?
There are several possible reasons why your file transfer speed is slow. Relayed transfers (see next question) usually have a slower speed than direct connections. The speed can also be dependent on the bandwidth available (up/down) to the sender/recipient of the file. If either party is using other applications which take up bandwidth, this will also slow the transfer. Lastly, if you are engaged in a Skype call, Skype will prioritize the voice traffic over the File Transfer traffic so that your conversation is not disrupted . The file transfer speed will improve when you end your Skype call. If you are running other programs which use your bandwidth, such as email, web browser, etc. these will affect transfer speed as well.

http://www.skype.com/help/faq/filetransfer.html