I hate loading... I suggest making a big loading when launching game, and no more loadings after that.
You can choose like:
Load Mizar
or
Load Sol
or
etc...
or Load all systems
And it loads it (WITH PERCENTAGE, so we know how long going to take)
And when you launch game you can go to the place you loaded before logging in simply!
(And for other systems you didn't load, you'll just have to "loading"....)