Hi Jim,
If you download the DSPLIB 3.1.1.1.for C66x , you will find the performance benchmarks in the Test reports in the doc folder. This can also be accessed from the link below:
http://software-dl.ti.com/sdoemb/sdoemb_public_sw/dsplib/latest/exports/DSPLib_c66xTest_Report.html
Regards,
Rahul