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Racer contains some features to perform profiling. Although not as detailed as what you can do with a compiler, this does give an idea of what Racer is spending time on.
The 'debug 6' screen contains a number of profiling items which shows where Racer is spending time. You'll probably notice most time being devoted towards graphics, especially shadow map creation.
With nVidia cards you can also check a few internal counters. These counter names are exposed by the driver so may vary from card type to card type, and with driver revisions. To get these running:
(last updated April 23, 2013 )