Hi Guest,
This is going to depend on your setup, its true that the network is smaller and there for less sources for your multipoint downloads which then would mean slower download speeds.
It shouldnt have on effect on your computer speeds or connection speeds.
Go to this page and be sure your set up is whats recommended. This will test your speeds for you and give you the settings that would be best for you.
https://www.winmxworld.com/scripts/bandwidth/Also are you on secondary or primary on WinMX.
What are you typical speeds you get now?
Let me know..