Smart TV slowing down our wifi speed question...?

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Ok, we have the regular modem/router from Frontier that they first installed and we also now have a spare Netgea N600 Router. We have a Vizio Smart TV upstairs and when it runs online (example:Netflix) the wifi in the rest of the house runs at a substantially slower pace for the rest of the devices causing lagging or low quality videos and very slow load times. Was wondering if anyone had any ideas on how to fix this or any tips or if there is anything we could do with that netgear router to help with being able to run multiple devices in the house without the slow sleep or lagging? Does the Smart TV take more internet that a regular stream device would? ( Example: Apple TV) Would it be wiser to just buy a cheap Roku or Roku 2 to set up in the upstairs Smart TV and run that instead to help the internet speed for the rest of the house? Thanks.