Stonehearth taking 7GB of RAM?

My stonehearth game lately has been lagging. So i decided to look at my RAM. Then i saw 9GB being used so then i closed stonehearth and it jumped all the way down to 2 GB of RAM. Is it supposed to take that much RAM?

Computer Specs:
Intel i7-2600K
2 GB Nvidia Geforce 760

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