AppleTV app playback on 2013 MacBook Pro choppy

I have an older MacBook Pro, it steelworks very well, I upgrade it as needed. Normally I view my media purchased through apple on my Apple TV because of changing circumstances I find myself spending more time at my desk and recently I wanted to watch a movie in the background on my second monitor while I work. I downloaded the movie I wanted to watch in advance, and when I play it, even though it is downloaded onto my hard drive, the playback is stuttering. It looks like it is dropping frames and it doesn't matter whether the screen is on my thunderbolt monitor, or on the laptop screen itself. I thought perhaps it may have been that there was some error when the file downloaded, so I downloaded a tv show that would download quicker and the problem persists, it even happens when I stream something through the Apple TV desktop app. I do not have this issue when viewing videos on YouTube, or content on Netflix or Hulu. Is there a cause to this and a way to fix it?