The fixes given bellow make the game run almost perfectly for me, however it lags greatly whenever the game needs to make a big list, such as selecting your entire OOB, which is no big deal, but more importantly, opening the leader list, making the game very annoying for any big nation.

Since there is no lag selecting a few units or opening the list of a nation with a small leader pool, I imagine the problem is on creating all the entrances on the list, however I'm not savvy enough to confirm which part. I also imagine this is not a problem for someone with better hardware.