What is this camera optimizer you speak of?
Yesterday I wasted hours on a scene with daz crashing trying to just render the IRAY viewport window. Found that deleting all of the off-camera assets fixed it.
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It's a script you can install in Daz which scans the scene according the camera you select and then you can hide or delete the non visible assets, deleting them does mean an irreversible thing if you need multiple angles from the same scene you shouldn't delete anything. When using it you should also check if no partly visible things are hidden.
I ran that optimiser on a scene with a car and it hid the cardoor on the far side of the car even though it was partially visible. and the things that are made invisible also influence the light in the camera since it can pass where an obstacle used to be.
Off camera objects sometimes need to stay in place if there are shiny surfaces that should reflect said objects.