Originally posted by qwerm:

areas out in the wild usually aren't too bad, I think it tends to pile up around larger bases though. If you can bear to do so, try to spread out your builds so they're not all in the same active zone as only active instances count towards the issue.

From there, I can recommend trying to optimise your build to use fewer separate building pieces and also to clear cut trees, rocks and other "removable" objects around your base area if you really need to cut down on nearby instances.

I will first try reducing the lights sources, but reluctant to "reduce" anything else to do with the actual base. I have trees everywhere, but that has never been an issue in the past, I had no low FPS problems before visiting mistlands.