As soon as I add a GUI3DManager to my scene, which is btw my second scene, it lags the camera inertia when mousing over a lot of meshes. My first scene already has a GUI3DManager itself, but deactivating it makes no change.
I took this further in private messages, but there wasn’t a solution yet. I’m thinking the scene starts to check every mesh that’s pickable on pointermove once a GUI3DManager is created and that’s what imbues the performance.
It was suggested I create a playground, as cloning my project was too much work, but I have too much on my hands too. I’ll revisit once there’s time.