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sorry but I don't speak English well I need help for kingdom harts 2

when i star the game everything go fast at 60-58 fps but when i star to play i slow down to 34-40 sometimes even to 15-20

how can i make the speed remain constant

am using PCSX2 0.9.6

and this is my laptop information
Microsoft® Windows Vista™ Home Premium
Service Pack 1 Build 6001
HP Pavilion dv6 Notebook PC
PC basato su X86
Processore AMD Turion™ X2 Dual-Core Mobile RM-75, 2200 Mhz, 2 core, 2 processori logici
Ram 4GB

please help me

You didn't show your full specs or settings so it's difficult to help, all I can say for now is enable the "native" option in GSdx and try some speedhacks.

Try the latest beta too, it can improve speed a bit:
http://forums.pcsx2.net/thread-3716.html