What plan are you on? There's a fair use policy that applies to the Go Large plan.
http://jetstream.xtra.co.nz/chm/0,87...,00.html?nv=sd

And here's some more info
http://www.geekzone.co.nz/forums.asp...9510&page_no=2
http://www.geekzone.co.nz/TheBartender/1603

You can do a speed test here & find out your download & upload speeds. Don't have any other programs running while you do the test.
http://www.speedtest.net/

Once you know your speeds, use the guide here to configure your LW.
Configuring LW for best performance