Planet editing problem

[Popper]

I am planet editing a pack with 150 object in it and medium res textures.
Recently it started lagging but not generally only when above 500x timewarp.
My problem is not that I lag but that if I go into another pack with over 250 objects and really high res textures it lets me go to max timewarp with no issue.

What could be the cause of this problem?

 

[SFSAbhishek]

It might happen if the first pack has planets close to each other, cause in that case the rocket has to deal with many planets.
Also it could happen if the gravitation is to high. I know it's weird but that has happened to me.

 

[Popper]

I tried to space the planets and stars further away from eachother, it didnt work but thanks