30% of your broadband alone doens't mean anything... Which is the speed you get? Bear in mind that the ethernet card of your tv is a 10/100Mbps so if, let say, you have a gigabit broadband you may expect max 10% of the available speed.
Another issue could be the way you measure it, if you use i.e. speedtest by Okla on the Tv browser it'll show a lower speed due to the applet itself rather than the physical connection.
All this things in any case are only meaningful if you have actual problem with real streaming, keeping in mind that Netlix at maximum resolution uses 15 Mbps and Amazon less the 30 Mbps. Some youtube video may arrive to 40. Nothing more than this on the internet.
