You could try using the D3D plugin.
It seems slightly less stable (no hitting escape and then continuing), but using my GeForce 2 GTS
I seem to be able to get almost 4 times the FPS in FF9!!
Try it and see!
I would recommend sticking with the opengl plug-in since you get all the fun new blending modes. Check and see if your drivers are up to date. There were new ones released the other day. www.nvidia.com and other sites. Also check on tweaking your video card settings. www.nvmax.com