Occlusion Culling not working on Android

Good morning everyone
I have a big scene, with middle poly environment, i can’t make it lowpoly.
Also i have some transforms with realtime updating cubemaps.
I tried it on my android tablet, but it doesn’t work well, it is really hard for the system.
So I used Occlusion Culling. In the Unity Editor the occlusion culling was working fine, but on the tablet occlusion culling seems not working at all!
Because there are no still changes in the performance.
What can i do? Is there any way to make a build with occlusion culling for android?
Please help.
Thanks have a nice day!

I have seen that occlusion is going fine, but the game is too heavy!
What can i do? Is there a way to make it light for the gpu?
My game is going with many many latchs, What can i do?

Ensure that you set the occlusion culling mode to the 2nd one, not the 3rd with portals as thats much heavier on the cpu.

If that does not help then you might want to ensure that you get even more stuff occluded and less detail in, cause then you are just overdoing it in general. That or the environment is totally not oc-able (outdoor terrains for example are basically useless for OC unless you are on ground level with masses of buildings and other statics that block - terrain foliage will NOT act as a occluder)