So If I watch a movie on my main display its fine, 0 buffer lag and delays.
But when I put in my tv hdmi into my computer, the movie pauses every few seconds to load.
Why is this?

are your tv higher resolution then ur main display? if thats the case maybe the streaming service will auto scale resolution based on ur monitor, and that could cause lag if ur internet cant handle the higher quality

My main display is on 1980x1080 and im not sure about my tv.
But I think its the same.

What vid card do you have?

1080 ti and my cpu is i7-7700k.
It has to be my internet or hdmi cable right?

This post was edited by Noodles4eva on Jan 15 2018 04:05pm

You need to find out what resolution your TV is. You should be able to use the TV remote to open the TV settings. In there you can poke around and see what resolution you are running the TV at.