How to change the material of gameObject efficiently in runtime?

Unity Engine
1

7025965--832216--upload_2021-4-11_10-49-42.png
7025965--832216--upload_2021-4-11_10-49-42.png1080×587 28.1 KB

I use this to change the material, it works. But I am a little worried about the Resources.Load , cause I need to call this function frequently.Will it slow the game,and is there any alternatvie with
more efficient？

Ps： cameraMaterials[index] is path in string

2

It seems that resources.load will not be loaded repeatedly

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