difference between the execution time of the DSP code on code composer studio and the execution time of the DSP code on DSP/ARM system (OMAP-L137)

Dear Sir/Madam,

I have designed a system included ARM and DSP processors on OMAP-L137 EVM. I designed and debugged the DSP side by code composer and calculated the execution time in terms of number of clocks. Then, I imported the DSP code in the ARM/DSP system and developed the required communication channel. I checked the execution time of the DSP code in the DSP/ARM system. The execution time of my main function is about 3-4 times more than its execution time on code composer studio????!!!!

What is the problem? I would be very thankful if you can help me.

Thanks,

Jone.