So, I used to be able to run the game on my iMac at "medium" graphics and I LOVE the stunning visuals that the game has to offer. However since the 10.10 upgrade (now 10.10.1) I've been seeing worse performance. So, I upgraded to 16 gig ram from the 4 that came with my system and not much improved.
Complicating that, FPS seems to change throughout the day. For example - yesterday it went up into the 25's so I turned medium graphics back on and fps dropped to 15 or so but i was able to play just fine. At around midnight, I noticed fps was in the 45 range! Went to bed, got up this morning and it is now 7-9 fps.
I don't really understand what is changing - can anyone point me to some helpful info on this topic?