3D Tiles : tile refreshed/reloaded all the time, how to control it ?

Cesium shouldn’t be reloading tiles at all. Do you notice this when hosting your tileset from another server, such as 3d-tiles-samples?

One issue with the tileset is the child tile doesn’t have a geometric error. It should be set to 0.0.

Hello,

I find out the issue, geometricError as you said but also 'Refine'

property on the child nodes.
When it is define and the children property is empty it kind a
consider it is not loaded completely and for odd reasons it starts
reloading everything
starting from the root tileset.json file.

A warning in the console from cesium would be nice.
Case closed.

thanks again.