Don't see to many questions about performance here but I hope someone can help. In a new house I'm creating I have some problems with performance in certain places. For example, at one spot there are many bookcases, bookcontainers, candles, lights and scaled down statues. I tried to remove all artifical lightning, which helps a bit, but the framerate keeps below 30. It seems the framedrops come from the number of object in line of sight. For example:
https://s1.file1.info/sdnMkzCh

I think I have to make this part into a separate interior but maybe someone knows some tips to optimize this part?

The typical culprit is lighting. The number of objects in sight is negligible in interiors unless you have a castle lobby filled with a thousand trolls.

Turn on View Light Radius in the CS and make sure none of your light sources are overlapping. You may have to switch some out for smaller strengths or larger strengths and use some artificial candles instead.

You're right, but it is also a combination of many objects and lightsources. Even lightsources outside the point of view impact the fps. If I remove all the lights, the fps is acceptable but the scene looks very dull. So I will create smaller rooms with better lightning and fps instead of two or three big fps dropping rooms.