You only need to make the material instance once, you’re making a new one every frame 
finally i didn’t ask what i wanted to ask, i’m making an endless runner game, and those screenshots are from my level blueprint and the material want to change the speed,but it seems doesn’t work im quite new about blueprints, i try to find how the people do but i just find for unreal engine 4 and seems doesn’t work, anybody know why this doesn’t works?
Yes that’s right, hahaha thank you
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