Yes, Client optimization please! especially for dual core cpu since the game is poorly optimized on those... (if you have 4 cores you won't see it that much as of 2 cores)... this game overally CAN have more than 50% (i would even said 80%) of lower system requirements if it was properly optimized... (it's based on little -> big reaserch I've done)
btw. with current state of FFXIV optimization i call it one big Play Station 3 Emulator ^.^
PS: Also from the annyoing things I've noticed (there are large number of them on optimization side) but the one that almost everyone can noticed, is that when your on empty area without players, the game is smooth like baby arse... but when you turn the camera into the direction of camp (even if players are far) it starts to drop down... and when you come in contact with other players... - they will slow you down... also the servers as a whole can slow down how the game runs on your PC and manage to drop FPS...
PS2: That was as a quick note, I'm to tired to write all the essey about my reaserch on client, and what causes the slowdowns etc.
PS3: post might have mistakes in words -> I'm sleepy.