Performance on a high End gaming rig

Hello, I really enjoy Stonehearth and i think it has a very bright future. Recently, i have been experiencing a lot of stuttering and lag, normally, it will occour after about 20 minutes of playing (may not be accurate, didnt really pay attention to the ammount of time i wasnt lagging) I do run on maxxed out settings but rightfully so with my specs(besided my RAM, which i need an upgrade to)

CPU: Intel I7 4790K @4.0GhZ
GPU: Nvidia Geforce GTX 980Ti SC
RAM: 8gb ddr3

Any help is appreciated.