Optimization of plants

Hi, I downloaded some plants from Warehouse to my model and i have problem. I want to export this plant to .3d and open in Cinema 4d, the problem is that these plants are making everything slow in Cinema, probably because they are too heavy but in Sketchup everything is ok. How can i optimizatie these plants? or do something to make them lighter in cinema? Thanks in advance and sorry for my English, I`m from Poland

add a the 3d Warehouse page to the post so we can look at it…