I would just inform my fellow players, that i tested the game on ramdisk, the entire game. The performance gain to an Sata 6Gb/s SSD especially Corsairs without Sandforce Controller is feeled very low. A bit more min. FPS and milliseconds faster in loading.
Too bad we can't trick windows to use ramdisk HDD as Ram, that the "doublebuffering" Ram and Ramdisk is not needed anymore. But anyways. Who dont have an SSD especially a new one and using very high settings, should consider to upgrade to 12 GB Ram+ for a Ramdisk.
The very annoying thing is, that the memory leakages of this game arnt solved with it, nor setting an PAE bit for all FFXIV exe. This game doesnt use more than 2 Gib of Ram. Whatever you do.
The main bottleneck is the vram and the decoding algorythm to decompress the gamefiles. The decoding seems not to be optimized in any form.
By all means i couldnt get instant loading into the game. To be true i nearly need 5 to 10 sec, whereever i am. So fast switching for characters isnt possible.
When i am in the game, zoning to other regions is within 0,5 to 1 second. Characters and environment is loading in an instant even in the crowded wards.

I7 Nehalem OC to 3,6 GHz on a W7 64bit OS. OC 470 gtx. 24 Gb of Ram
All settings max besides Depth of field off. 1920 resolution.