Thanks for the reply. I am definitely familiar with the perf of IE10, my main purpose was just checking if the Windows app had a any additional optimization for html5 apps. Without webGL or a Windows 8 implementation of appMobi's directCanvas to give some added performance I am trying to make sure the games perform well as Windows 8 apps and Windows phone apps without having to alter the experience too much.
I still have my fingers crossed that there will be a Windows based option that works in IE to bring game perf and framerates up to a similar level as the above mentioned technologies.