Can you tell me a bit more about that? If there’s a missing feature or an issue you ran into we’d love to know.
Cesium ion automatically chooses the tile format to give you the best performance. What format is your source data? If you’re using CityGML or KML/COLLADA, and you have one model repeated in many different locations, that’ll be instanced in the final 3D Tileset. This is how this Switzerland government portal set up its viewer with 70 million trees/houses etc: 3D-Viewer - swisstopo