Hanky, with any new PC game/mod, you have to consider purchasing a new PC. A relatively "new" low end PC can run FH2 on high settings for about $500. You must change with the times besides a "standard" BF2 rig was probably bought/built between 2004/2005 with technology older than that.
@Mud Budda
Playing with a high end rig on low settings you get maximum fps with transparent undergrowth is an advantage. I only wish players would be required to have medium or higher settings for shadows enabled/dynamic light which is another advantage of playing with low settings.