Also having this issue. Will teleport to Limsa, Mor Dhona, or Coerthas...and the game client will drop to under 10 fps, my cpu will go up to 50%...then crashes to desktop. FFXIV is usually at 59-60fps except when this happens. Also experiencing a random slow down or stutter in some instances, like Ultima Hard and CT 1, which leads to the monster not appearing (invisible) yet still being able to target them at least.

Running windows 7 pro 64 bit fully updated, intel i7-4770 3.5GHz, 16gb ram, Radeon 7750 HD with current drivers.