Choppy gameplay / frame skipping in build

I threw together this scene with minimal detail, no trees just grass on an island. Yet even at the lowest possible resolution and lowest graphics quality I still get heavy frame dropping. Every second it skips as demonstrated in this video.[link text][1] [1]: https://www.youtube.com/watch?v=OgPFEvS5uls&feature=youtu.be

It's worth mentioning I have a decent rig that runs Farcry 4 smoothly at nearly maximum settings so how can this simple scene be so choppy?