It seems that some players have extreme performance issues, to the level were the game is barely playable. The exact circumstances for these issues are not known however, and as such we have chosen to hire the help of expert consultants. We hope to be able, with their help, to solve this problems and make sure that all will be able to enjoy the game. However, if there are some that cannot be helped, refunds will be given.
Please have a look at this related forum thread: http://forum.paradoxplaza.com/forum/showthread.php?680825-Regarding-memory-issues-for-some-users