Low FPS on PC,Low FPS on 1080p

Hi, i am new in Unity but i make very nice scene, i try game on my PC - gtx 660 and if i set 1080p i get very low fps, i send to friend with gtx 960 and maybe get maybe better but still very low fps, when i remvoe lights from scene, fps going better but still low, any idea how to optimize scene and what is important for “normal” fps? like 30?

You haven’t given any information, so I’ll just put you some good and useful resources:

I look some statistics, i removed all effect scripts, custom sky and etc, and there is some problem with big building (my friend make this model, and there is a lot of parts, and i put textures, when i look this building i got almost 6.5k draw cells :confused: