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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