Some test result with P4C 2.4@3.0ghz 6600gt(agp, not overclolcked)
512mb ddr ram synced with CPU and FFX (SLUS_203.12)
Tried to test at save points where the scene doesn't change a lot,
so if others test from the same points then we could compare our results...
(memcard, and my pc, and pcsx2 settings attached)
i just put a save state at load menu to be able to load much easyer

and waited a few second after loading, and chechked the fps for 10-20 sec for min/max numbers...
FPS results:
save normal AAx2 AAx4 AAx4+BF
menu: 51.1-51.3 51.1-51.3 51.1-51.3
1: 19.3-21.3 18.3-21.3 11.6-19.0
2: 36.5-39.4 35.2-39.4 23.x-39.x
3: 17.1-19.0 16.0-18.3 11.1-15.1 6.4-11.7
5: 19.7-22.3 18.3-21.3 11.x-17.1
7: 16.5-17.7 16.5-17.7 16.0-17.1 12.8-15.1
12: 42.7-44.6 40.9-44.6 39.3-42.7
13: 26.9-30.2 25.6-28.5 24.3-28.5
I think from cpu point of view only the first column is important,
but i tested with AA too, this way we know wich results are gpu limited,
and wich are cpu [+ram+..

] limited...
so looks like savepoint 7 is the best (from these 8) to test the cpu...