Search 'FPS Booster' in the search box of the steam workshop (of starbound). Subscribe the FPS Booster 1.0 mod. That mod literally boosted my FPS, and i'm on an extremely old, low-end pc. Hope this helps. P.S: This mod removes the Starbound background, so if you're not that desperate or you just love the background and not having any problem with your fps, you can just.... not install the mod.