We're doing a "see the world" application, where we have a website using Cesium go through and zoom on various national parks and cities throughout the world. One thing that we've noticed is that it takes 3-4 seconds to get Imagery tiles. The list of destinations is not very big and is static.
While looking at the demo app: http://cesiumjs.org/Cesium/Build/Apps/CesiumViewer/
There appears to be almost zero lag.
Using, default out-of-the-box Cesium, what are some tweaks we can make for better performance? Is there a caching mechanism for Imagery tiles that we can turn on?