loading very large dataset on cesium js

We have just started to develop on cesium, and we are very impressed of it.
Currently, our products are based on google earth plugin. Now, we want to move them to crsium js.

Our main problem is displaying very large datasets from a server. Currently we are using hierarchical region based kml (https://developers.google.com/kml/documentation/regions) and we are wondering if there is an equivalent to this feature in cesium or there are other approaches to solve it.

Thank you very much,