You wake up one morning, get into work, grab your morning coffee and log into Web Center Sites.  As you sip your coffee you look at the Site Plan Tree tab, which contains the 600 or so pages that you painstakingly organized with pride.  You get an email saying that now Page X needs to be moved under Page Y for the breadcrumbs.

You put down your coffee and you start to drag Page X under Page Y.  Page X has 100 pages underneath it and the dragging seems to lag.  You let go of your mouse button only to see the Page and all its children disappear.  You frantically expand various nodes...