Why clock speed is much higher than processor(f28335) when measure task execution time in code generation？

Hello, i did code generation in Matlab 2019b. my processor is f28335. I need to know the time code executed in f28335. Simulink have a function to measure it bur the task execution time in profile made me confused: why clock speed is 2592 MHz while frequency of f28335 is up to 150MHz? If the profile cannot show the real time code running in processor, what does this profile mean and how to measure real execution time in processor?

Thanks a lot