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This question already has an answer here:

I have a model containing about 30 objects, all together about 900,000 vertices. My computer can't handle this amount of verticies and it gets realy slow. Is there a way how to turn on/off subsurf to all these objects at the same time?

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marked as duplicate by David, VRM, p2or, Ray Mairlot, Gwen Mar 28 '15 at 18:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Simplify

Enable scene simplification in Properties > Scene > Simplify and set the subdivision level to 0:

enter image description here

Copy to selected

  1. Select all the objects
  2. Disable the subsurf modifier in the viewport, then RMB RMB> Copy to selected:

enter image description here

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