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Performance problems with Windows 2008 R2

We are experiencing performance issues when using windows 2008 r2 to serve our web site. It seems to consume more than twice the % processor time and serves requests half as fast as a windows 2008 32bit server on the equivalent 64 bit compatible hardware (HP Blade BL465c).

To further examine the performance issue, we wrote a very simple test application using c# which carries out some numerical operations on int32, int64, single and double data type, it shows windows 2008 32bit outperforming windows 2008 r2 for all datatypes. Does anyone have an explanation as to why this is the case or an idea on how to improve r2's performance.

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