[Low FPS] Culling %99 in Profiler

Im working my game about 2 years. Now its finished but I have really big issue. FPS usually 6-7 in game. I can’t solve the problem. I deleted shadows, deleted trees, deleted all things but culling keeps %99 in Profiler.

First I disabled Occlusion Culling in camera. And I wrote a script with

camera.useOcclusionCulling = false;

And It doesn’t work… Please help… Why I have this problem?

are you sure’ve optimized the game? are you sure that your PC is powerful enough to run the game?