KOS vessel modules appear to be added to things that don't really need them

[JonnyOThan]

flags, asteroids, probably debris...

Also uses FixedUpdate, there might be a better option?

[Dunbaratu]

Well, I mean technically a flag is a vessel, in the game's object hierarchy. I don't know (other than just hardcoding which class types to omit) what flag or criteria we could use to detect "this vessel isn't really a vessel. At least not that kind of vessel."

[JonnyOThan]

other than just hardcoding which class types to omit)

that’s probably where I’d start. There can be hundreds of asteroids, flags and debris in the universe and this can be a significant performance hit.

In fact..is the VesselModule only needed for loaded vessels? I’d assume it has some role to play in message handling but I didn’t see anything in a quick skim of the code.

[SofieBrink]

The vessel class in KSP has a CurrentControlLevel property, You could probably simply exclude any vessel where this is ControlLevel.NONE to avoid hardcoding based on vessel types.