Unfortunately, the eco sunrays and aurora borealis are completly broken at the moment and cause severe lag. That's why I finally decided to completely disable those effects.
I'm well aware that there is already a similar mod available on MTS, but as this one marks uploaded lots in the galery as using CC, I decided to share my own version which does not have this flaw.
The SimNation Travel mod adds a new travel system to The Sims 4 that allows your Sims to travel to different worlds within the same save file. This means that your Sims can visit different vacation destinations, explore new cities, and even go on international trips.