Rails core - Jul 2013 - Ruby on Rails performance issue on Amazon EC2 instance

Hi,

I''ve tried to install and run the benchmark script 
at https://github.com/TechEmpower/FrameworkBenchmarks but I never got as 
much performance as it stated on the website 
at
http://www.techempower.com/benchmarks/#section=data-r6&hw=ec2&test=db&l=35s&w=t

The peak performance we got is around 450 requests/second. The result from 
them is 750 requests/second.

Could someone help us? I think we may did some mis-configuration.

Thank you!

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