I know there are some people saying they are having alot of fps and choppy issues in the beta. Some have very good pcs while others dont. Some people with bad benchmark scores and older pcs have less problems then people with very good pcs.
i just wanted to give some advice since for those that may not know. In FFXI I knew alot of people that complained about the very same things. Some of the reasons that caused the issues were as follows.
Streaming music while playing on a slow internet connection while playing.
Downloading stuff in background while playing.
Other people on the same internet connection in the house doing those things as well while playing.
Bandwidth can cause alot of fps issues as well as graphics cards. So you might want to do some process of elmination if you think your pc should be running fine and it isn't.
Hope this helps.