<A target="_blank" href="http://www.thenewdominoadmin.com/blog/?p=2359&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheNewDominoAdmin+%28The+New+Domino+Admin%29">Marc Champoux upgraded some servers from Sametime 7.5.x to R8.5.2</A> and ran into "time out" issues. It seems part of the problem is large Public Groups in Contact lists. He explains how he discovered the quirk and how he's working to fix it.