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SYS/BIOS contribution to CPU Load (Is BIOS recommended for very CPU demanding programs?)

Hi, I am developing a rather demanding CPU program (TSM320F28335) (we use CCS v5.1, C2000).

We have 3 interruptions triggering at 500kHz, 50kHz and 5kHz. The CPU is at its limit to be able to perform in Real Time and I would like to know (We are not using BIOS):

1. Is there any graphical way to see the time spent in each interruption with NO-BIOS? CPU Load? As far as I know: NO. At this moment I measure the interruption time with the "profile watch", but it doesnt give me the best-worst cases.

2. Do you advice me to move my program to SYS/BIOS (currently we are without BIOS)? 

3. What would be the SYS/BIOS contribution to CPU Load? Remember that we are in the limit of CPU Load.

Thank you in advance, and I am sorry if it not the right place to post.