HitFilm choppy when I put more then two video clips on the timeline

I've looked around the forums, and couldn't find any discussions about my particular problem yet. HitFilm runs perfectly until I put two video clips on the timeline. The playback then runs slowly, but the exported project is fine. This is just an annoying little thing that would be nice if I could get some help on. 

The video clips I normally use:

1080p mp4 video at 59.94 FPS*

720p mp4 video at 59.94 FPS**

 

*This is the rate at which I changed it to while it was still in the media bin. The original rate was 59.

**This is the rate at which I changed it to while it was still in the media bin. The original rate was 60.

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