This video shows the performance improvements you can see when loading 3D object scene layers in Scene Viewer or JavaScript API. This scene is showing New York City buildings in a 3D object scene layer hosted on ArcGIS Online. The improved scene layer loading performance is a part of the Scene Viewer December 2017 & Esri JavaScript 4.6 update. Learn more, here: https://doc.arcgis.com/en/arcgis-online/get-started/get-started-with-scenes.htm