Smart tv with evo

If I will use smart tv and dsl at the same time then the speed of the internet connection of dsl or smart tv will not be effected I think. If I will use smart tv with evo and I will use smart tv and internet connection through evo at the same time then the speed of internet or smart tv will be effected or decrease? The speed of any internet connection of evo will determine the performance of smart tv if one will use internet and smart tv at the same time?