Is that a Laptop?
First of all, your current CPU is much lower than the minimum requirement,
whereas 2.6Ghz(for Core 2 Duo) can run most a game at playable state,
while 3.2GHz is recommended if you want to have reasonable speed.
Second, your GPU is weak as well, since it was integrated, the non-integrated graphic card is what recommended for PCSX2.
Third, FFXII is one of the demanding games on PCSX2, by that, you need to have an overall strong computer to emulates it, especially the CPU.
However, try these settings :
- check Native resolution on GSdx settings
- Enable Speedhacks, slide the EE bar to maximum(or enable all options, except the MTVU).
- Set both Clamping modes to None.
and hope for miracles to happen.