So that's a given, so get wired on the TV as a test. If it's unacceptable you return the set for this reason since it's unlikely they can fix this.
Here I use an Amazon Fire TV because you guessed why.
I connect this Vizio smart TV via wifi extender ethernet cable. The laptop shows good speed but sometimes streaming on smart TV gets really slow. If I do the same streaming on a PC or phone, they are fast, no delay. Does smart TV get their data directly from say youtube, netflix or it goes through their brand's server first? say I have a Vizio smart TV, the data goes through Vizio server first? I am confused since I can't explain why when streaming on tv is slow, phone and PC are streaming fine.