I have a SharePoint 2013 farm with two app servers and three WFE's. These are running on W2012 Server. I have implemented App Initialization thinking that this would replace what I have always done, used a PowerShell script to warm up the site. I do not see any improvement in performance really however, so either I have App Initialization implemented incorrectly or it does not warm up the farm as I thought it would. Any advice or ideas would be appreciated.