We’ve had a Magento expert look at our website with your theme. They indicated that the implemented Nova Menu isn’t caching through the default Magento 1.9 way. The custom blocks are processed every time a user loads a page instead of making a cache block, adding 300ms page load to every page, all the time, always.

You can see the difference in default magento 1.9 and the sns nova menu here:
code/core/Mage/Catalog/Block/Navigation.php class Mage_Catalog_Block_Navigation
code/local/Sns/Nova/Block/Mainmenu.php class Sns_Nova_Block_Mainmenu

Is there a solution for this? This would really speed up your theme.