There's interesting work being done by the guys working on the Unity game engine. Their new data-oriented programming model (still based on C#) promises efficie

There's interesting work being done by the guys working on the Unity game engine. Their new data-oriented programming model (still based on C#) promises efficient packing of objects into arrays of properties which (supposedly) results in massive performance gains thanks to sequential processing. They also have a custom compiler optimized for this scenario. However, AFAIK there are no plans to provide this separately from the engine (on the other hand, they've been separating out a lot of functionality into optional modules so you can go really light).