Last time i went to natalan with like 40ppl quite lot of enemies around us and windy weather my fps came down to low 20s while my gfx load was hiting 60-70% thats when i decided to look at core graphs for the 1st time and one of em was hiting 90s while others were in the 30s then i did this few tests in uldah. Btw this doesnt happen in gridania or limsa since theres pretty much noone there and that core barely hits 50% load.