Essentially here is a good slightly technical story about CPU's and GPU's.

"A computer is like a cardboard box inhabited by a pair of elves, Charles Pitchwife Underhill plus his younger sibling George Pekkala Underhill (both more commonly known by their initials).

Charles is smart, well educated, and fluent in dozens of languages (C, C++, C#, and Python, to name a few).

George, on the other hand, is an autistic savant. He finds it difficult to communicate with anyone other than his brother Charles, prefers to plan his day well in advance, and gets flustered if asked to change activities with insufficient warning. He has an amazing ability to multiply floating point numbers, especially enjoying computations that involve vectors and matrices.

When you run a program on this computer, Charles reads it and does whatever it says. Any time he encounters a graphics drawing instruction, he notes that down on a piece of paper. At some later point (when the paper fills up, or if he sees a Present instruction) he translates the entire paper from the original language into a secret code which only he and George can understand, then hands these translated instructions to his brother, who carries them out." - http://blogs.msdn.com/b/shawnhar/arc...-in-a-box.aspx

Basically your Charles (CPU) is busting his ass around the clock to get enough work for George to do but he can't.

What's worse is that your George (GPU) isn't all that fantastic either for FF14's rendering engine; lower the shadow quality (Medium), Disable Shadow Cascading, and disable Limb Darkening, SSAO. Also I bet you might even see an FPS increase by disabling Occlusion Culling. Disable Reflections and turn off Vsync and FXAA, set Grass to low or off, and set the game to fullscreen @ your resolution. Oh! and also disable Physics as those calculations are most likely done on the CPU side.

Once you get your FPS back up from that (if it goes up) you can slowly start turning things on / off.

I hope that helps; and it's 4AM here on the East coast so I am heading off to bed.