I run raids at fairly good performance(20-30 FPS most of the time) at these spec's:
Envoyé par Ef-John
Mac Pro (1,1) 2006
2x 2.66 Intel Core 2 Duo's
6 GB DDR2 RAM (667 MHZ)-This is a lot slower then yours btw.
Ati Radeon 5770 1gb VRAM
I would agree with valamar, you need more RAM, I would say at least 6. That graphics card of yours isn't too good either, I'm fairly certain you can't upgrade those in an Imac, but getting a better one would be a good idea. The 2600 is the min spec for a lot of "light on graphics" games, including LOTRO. I would recommend turning everything down. Make sure your game is running in DX9, and that Post processing effects are off and that most graphics settings are on low.
Bretela LVL 100 Warden Gwaithol LVL 100 Hunter Brilliance LVL 86+ LM
Mac User, Raider