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?
Enable scene simplification in Properties > Scene > Simplify and set the subdivision level to 0:
Copy to selected
- Select all the objects
- Disable the subsurf modifier in the viewport, then RMB> Copy to selected: