Star Citizen FPS Differences between Online/Offline

I am just wondering if maybe someone knows more about this than me, But I was wondering why my FPS dramatically drops on 'Universe', but is really good on star marine, and offline.

Specs: GPU: EVGA 960 4GB SSC CPU: Intel Core i7 4790k 4.0ghz (4 core) Ram: 8gb DDR3 Motherboard: Asus Z97-A DDR3 Storage: 1TB HDD and 250GB SSD