Cities: Skylines GPU Usage hovering 90%-100%?? R9 390

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When playing on a city with around 7,000 people, my fps hovers around 45 which seems low but I am not sure. But the weird thing is that from what I have read, Cities is a really CPU heavy game(I have a fx-8320 OC'D to 4.8Ghz) and the max usage from one core was about 50% whereas the GPU is hovering around the 90%-100% mark. Help!

My full specs:
MSI Gaming 970
Fx-8320 OC'D to 4.8
R9 390
Thermaltake R2 850w