More than likely, you're problems are coming from overhead with the threads.
All those recursive invokes are killing you. This article http://reedcopsey.com/2010/02/26/parallelism-in-net-part-11-divide-and-conquer-via-parallel-invoke/ is very relevant.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.