The team transitioned the game from an internal engine to the Havok Vision engine, which oversees the 25 middleware engines that handle aspects like the AI, atmospheric effects, networking, and more. He says that optimizing the game has been "touch and go for the most part," however.
Smart predicts that next year should be interesting for Line of Defense. "All things being equal, we should be rolling in awesomeness by Q2 2014," he writes. "Prepare to have your mind blown. Guaranteed."