Uploads Slow or Timing Out
There are a variety of reasons for uploads to be slow. But this page is dealing with the REALLY slow ones or the ones that time out every time.
For those with a Router
If you are behind a router...this link may help you port forward your router (goes to a remote site). Port Forwarding and setting ports could resolve the problem. Also, if there is not information specific to your router, and you do not see anything close to it on the site, you can always go to PortForward.com Their information isn't WinMX specific, but they do a really good job walking through on most routers.
Changing the WinMX default ports for TCP and UDP
There is also the possibility that you ISP is blocking WINMX's default ports, to check this u will need to change your IN/OUT UDP port.
(16257 instead of 6257 for example). Remember if you try this solution these ports will have to mapped through the Router (If you have one) just as the default ones were.
Go to settings,