Galaxy forge maximum planets

Hello

A few days ago i started using the galaxy forge(rebellion) to make some nice more realistic solar systems and to try and build a nice little galaxy.

Unfortunately at around 230-240 "planets" the forge gives me a popup saying i have reached the maximum planets for this galaxy.

While this is not a low amount i do believe that it could be much higher since i have read about people having 500+ planets before.

I try to make my solar systems somewhat random with many planets and even stars having only a chance to spawn, so in reality there's only about 150-180 planets when the game starts.

Another problem i have is that the forge begins to become very sluggish once i get around 100 planets. Is it possible that it just doesn't run well on high end systems?

In game it's no problem at all, i can run huge systems with hundreds of planets with max graphics without even slightly lagging.

I tried googling and using the search function on this forum but didn't really find any answers to this, i hope someone knows how to resolve these issues somehow.