I've looking into Bethesda Games habit of using the same archaic engine gamebryo which they have been using since fallout 2. Shit there is only so much weight you can load on an old horse before it's back breaks. I honestly can't remember the name of the game(an alien type action shooter) one xbox 360 but it used four of the best engines at the time Euphoria, Unreal Engine 3, Chrome Engine, Cryware and Havok there was at least six engines running on that game. But yeah I am dumbfound to why bethesda refused to get rid of gamebryo I dissected the code used in skyrim which was full of memory leaks and incompatible software/ hardware code well this issue applies mainly to consoles not so much on pc unless you have a low amount of RAM than its on somewhat equal ground Unless your a nexus mods guru.