Why SharePoint 2013 Cumulative Update takes 5 hours to install?

I recently went through the process of applying the latest SharePoint 2013 Cumulative Update on my multi server SharePoint 2013 Farm.   To my surprise, I found the total time to apply the patch (install the bits) took over 5 hours per SharePoint Server.   This time doesn’t include running PSConfig which is considered phase 2.   My SharePoint 2013 farm is hosted by a Windows 8 Hyper V environment where my VM’s meet the minimum hardware requirements for memory etc.   I found that as I started to gracefully terminate other SharePoint services running, the time of subsequent patch runs started to drop tremendously.   I suspect the following:

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