...
You should accessing online meetings using a wired ethernet connection, these applications are demanding on the network and the packet drop can be high over WiFi and you will tend to experience lag, dropped audio and other connection problems. If at all possible, you should use a wired connection, especially if you are hosting the webinar or chairing the meeting. If you can't get a wired connection, you should consider using audio only (no video) as this will help with the badwidth.
Environment
Lastly, your environment should be reasonably quiet, comfortable and have a ready supply of coffee.
...