Here is the code that i try to add planty of POINTS into the viewer.
I think chrome might be running out of memory trying to add that many point primitives to the viewer.
Cesium is able to handle adding many thousands of point primitivess (see the ‘add 100k points’ example in this demo)
For our upcoming 3D Tiles implementation, we’re working on implementing support for point clouds that can handle many many more points. See this blog post for a point cloud example: http://cesiumjs.org/2015/08/10/Introducing-3D-Tiles/