Initialize and destroy sub tree of tileset dynamically

Hi, I want to load large-scale 3d tiles(>1 million tiles, > 200GB, 1million for example) in cesium, but found that each Cesium3DTile in js(in chromium v-58.) holds about 3kB memory, which means the full tileset tree holds about 3GB memory.

I found an dynamic loading skill in class Tileset3DTileContent->initialize, and want to destroy the subtree of tielset dynamically.

Is there a feature in cesium, or is there a way to support the feature?