It is "real" displacement. The embedded C5 displacement allows for animated textures, too. The more polygons you add, the more your computer has to "think" about it. ;) There are options with both to turn-off real time displacement in the 3D view to make the assebmly room not slow to a crawl if you've got something really detailed. It is like AGrooves but a little more robust in some areas. However, DCG's products has some great optimization when used with primitives. DCG has released a beta update for it's plugs to try with C5. Give it a whirl if you already own AGroove.