Found a bug that causes the simulation to lag... a lot. Included Log File and Picture.
Earth's city lights are abnormally bright. When you Zoom-in that's when it starts lagging but it's fine when you Zoom-out.
To try yourself:
1. Click the home menu
2. Go to the "Main" tab
3. Open "Exploring the Solar Neighborhood"
4. That's it should be lagging now