If an object/Geometry etc is removed from the scene are they still computed?

unfortunately I’m beginning to run out of issues with performance,

especially when I’m moving a first person camera around, it’ll just skip and spaz out and move the character way outside the map if I’m running too many things at once.

I’m wondering if when I remove objects from a scene (with an event listener) are those objects still being computed even though they’re not visible?

because I have a particle array system which I want to remove at times but I’m not sure if it’s still being computed regardless of if it’s added to the scene or not

When 3D objects are removed from the scene, the renderer does nothing with them. No world matrices are updated, no view frustum culling happens and of course no rendering.