Bug/Issue Still runs extremely slow.

Hi there, good evening. I've been playing the Starbound - Unstable for a while now, but it still runs really slow and choppy for me. the only place i don't have it, is on my ship.
Anyone else with this problem, and anyone knows a fix for it?
I'll also post my specs so computer wizards can tell me if something's wrong:

Processor: Intel(R) Core(TM) i5 CPU 650 @ 3.20GHz 3.20GHz
RAM: 4,00 GB
System: 64 bit
Nvidia GeForce GTX 750