HitFilm Running Slow Editing 4K

Computer:

Intel Core i7 3.5GHz

RAM 32GB

GeForce GTX 745
Window 10 Pro
HitFilm Express 11.0.8

Files 
4K MP4
23.98
48k

What I've done:
I have adjusted preview mode to "None",  Audio size to "Small", Video Size to "Small".
I have changed Playback Quality to "Draft", Playback resolution to "Quarter", Paused Quality and Resolution to the smallest settings.

Problem:
Video playback is choppy, especially when playing transitions. 
NOTE: There are no effects added, this is just the raw video files. They are maximum 3 mins in length, and when 2 short clips of 10 secs each are on the timeline playback is choppy. 

Any ideas to help it run smoother would be appreciated!
Thanks.  

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