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CCS/TMS320F28335: Computational time reduction

Part Number: TMS320F28335

Tool/software: Code Composer Studio

Hello,

I am using TMS320F28335 DSP chip for my code execution for three phase inverter. For switching, I am using double sampling technique. The switching frequency i want to design is 20kHz with sampling frequency is 40kHz with sampling time equal to 25usec. But, for code execution, the computational time is above 25usec. 
Can anyone guide me how can I reduce the computational delay in my code?