'Not-render'-function while 'Not-in-cam-sight'

Hello - I have been noticing that I still get lag-performance-issues when through out my scene despite the camera should not be rendering heavy stuff in sight.
As such heavy stuff outside of view is still being rendered/calculated (and I have to make these things invisible - dis-enable them).
Is there or can you make a function like: ‘Not-render’ while ‘Not-in-cam-sight’?

Engine can do that automatically if you enable the Frustum Culling property in your camera:

Enable the Profiler and watch how the polygon count changes when models get visible/not visible.

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Thanks it works quite well