I’m using a renderer feature (Render Objects) for a portal rendering effect. This is only needed occasionally, so I enable the renderer feature dynamically. The performance impact is quite big, even without rendering any objects, but I could live with that. What I can not live with, when I turn the renderer feature off again, performance does not go back to normal. Some irreversible overhead is still present.
I also tried switching between two separate renderers, one with, and one without the extra renderer feature. Same result. I suspect this might have something to do with an intermediate texture getting introduced, and never removed. The overhead is on the GPU side. Testing was done with a Meta Quest 3.