Generally I get great performance. However I just flew in Paris at night & my FPS dropped from usual 35-55 fps to 15-20 fps! Does night or lights clobber fps? If so why & is there any setting at night I can change to help? ! 
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same london
I am having the same issue anywhere with lots of floating light bulbs the performance of the sim comes to a crawl.I think its a GPU hog.