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CCS: FOC of PMSM, speedRef = _IQ(0.8),the respond is slow.How can I change the parameters?

Tool/software: Code Composer Studio

Hello, I am using CCS to control the PMSM in FOC, while speedRef = _IQ(0.3), the respond is quickly. But, when I change the speedRef  = _IQ(0.8), the respond is slow. I guess the problem is the parameters.But which controller parameters should I change? Please help. Thank you.