Start of this year we upgraded our NAV 2016 installation to NAV 2018 RTM. And February 26 we were live. It was a relative smooth and fast upgrade and we were quite pleased with it. We ran however into a couple of performance issues of which one them exposed itself immediately after go-live. We were pointed to it by one of our sistering team's consuming a number of NAV web services in their application. But unfortunately we couldn't get a hold on what was exactly happening, so it was lingering…