It's a mystery to many people: why servers created from a wireless connection have so much lagg? It's very simple, the wireless connections perform updates all the time and this causes a lagg of about 5 seconds.

Solving the problem:

1. Go to Start > Run;
2. Put msconfig.
3. Click the tab "Services".
4. Look for the Wireless Zero Configuration option and disable it.
5. Click Apply, then OK.

Note that Windows will not connect automatically, for example, when the computer starts.