FFXIV and AMD have never been smooth together. I've known quad-CF systems struggle for no apparent reason where, in reality, they should make the game look like a Win95 release speed wise.

The truth is that I have no idea what goes wrong. My system was perfect for 2.2 but when 2.3 was released I started to get slowdowns to 5fps then crashing. EVERY TIME I PLAYED. Only change being the update from SE. I have since upgraded to a very powerful rig (i7-4820k, 64GB DDR3, SSD (Evo Pro), dual R9 290 on an Asus Rampage Black Edition... But I still only get 20fps max in Idyllshire if it's busy OR if I'm standing outside of it looking at the big monolith (no other characters around). I don't overclock at all, there should be no need.

The DX11 client resolved the 5fps > crash issue though.