Visualizer runs slowly when in fullscreen

I am using Djay Pro on my retina MacBook Pro (13" Early 2015) and when I run the visualizer in fullscreen it plays at a lower framerate and quality. It’s preventing me from using it in fullscreen. When it’s not in fullscreen it runs just fine in the preview window. Why?

I tried running it in low resolution mode but it didn’t help. I still can’t figure out what’s causing it