Thanks for the feedback.
The nebulae actually are visible, I was just trying to make them a little harder to navigate; they're a faint blue.
And yeah, the silo's are coming in later.
As for the comet hose, well only one race (the Aspians) have them, and the Aspians are THE most powerful race in the game (the Aspian Devastator beats the Kawangi)... and rare. The comet hose is just a mass driver with different coloring and point-defense capability, so I don't think that's the cause of any slow frame rate.