Feedback (Best Practices) Creating interactive tour with 360 images for OculusGO, Spheres or Scenes ?

Hello everyone,

I have made a virtual tour with 360 images (equirectangular) that is taken inside buildings to show tactile markings. This project focuses on universal design and people with vision loss. The app is for OculusGO and made for students studying architecture.

This is what I have done so far:
Made 5 filters (Eye Diagnosis) that is placed in front of a camera rig (left and right eye), and you can switch to each of the diagnosis, and move between the spheres inside the scene.
All works!

But when I switch between the scenes it freezes for a few seconds. Is it because of 22 spheres which holds a equirectangular image. Is it a limit on how many spheres the scene can hold before it will start lag?

The question is
Should I make 22 scenes instead of spheres to solve this problem, and is it an setting I don not know about to make it smoother ?

Thanks

mvh//regards

Hans E Sørli