When you virtualize lot of MS Window workloads you can observe lot of "Memory Pages/s" from virtual machines to physical disk subsystem (system swaping inactive memory pages to hard drive) . If you haven't enough IO performance in your storage your virtual machines becomes slow. For virtualization is normaly used SAN environment. Don't forget design capacity and performance on your storage for page files. If you want to tune your MS Windows and optimize page file IOs to your storage try disable (if you have enough RAM) or optimize Windows Page File.
Articles about this topic:
http://www.techarp.com/showarticle.aspx?artno=143
http://www.petri.co.il/pagefile_optimization.htm
http://www.instantfundas.com/2008/07/disable-windows-page-file-save-your.html
http://www.windowsdevcenter.com/pub/a/windows/2004/04/27/pagefile.html
http://smallvoid.com/article/windows-page-file.html
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