I am currently replaying FS2's campaign, and I have noticed one very strange problem. When my ship is pointed at nebulea, or a planet, the FPS drops from 60 or 70 to 30 or 40 (!). I am using an very old 8400GS graphics card ATM, but it seems to me that these slowdowns should not happen for simple textures like this. The problem occurs regardless whether or not the MVPs are used.
Notably, the problem does not appear to occur with suns.
Currently quite unsure how to properly turn this into a bug report (specifically, how to record this problem), so any help on that front would be appreciated.