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Materials for VR - how many?

Greetings Developers.
My question is about VR and performacne standards.

  1. How many materials I should use in VR projects. Let say I need to create about 10 materials and 30 material instances. Is there big difference in performance with 1 material and 50 instances, vs 10 materials and 30 material instances?

  2. Is this possible to create a project with only 1 material, and rest just material instances.

  3. What about painting landscapes? How this influence performance? Let say 5 material instancec as landspace paint layers.

Wish all of you unreal sattisfaction :wink: