Adding performance notes to the README for our HPCC benchmarks... 
Adding performance notes to the README for our HPCC benchmarks... 

...so that people don't think they're don in that regard



git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@18239 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

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