My Students are having lag and freezing while going through the "Wizard of oz" curriculum project

I’ve recently started using Sketchup for schools with my students. We are starting with the “Wizard of Oz” project in your curriculum My school issued mac is having no issues, and some students have used their think pad with no issues, but some have the program freeze up when loading componants. Any thoughts or tips?

Are they loading components from the 3D Warehouse? If so, watch for the file size of the component. A few trees can grind it to a halt as most of the heavy lifting is being done in the cloud.