The recent release of Cesium 1.57 has added a whole bunch of improvements, one of the most exciting being a dramatic improvement in performance of 3D Tiles. The linked article covers how they achieved this from a technical perspective. Nice!

Up to 10x Faster 3D Tiles Streaming | cesium.com
As part of our ongoing effort to optimize Cesium for the smoothest user experience, we’re excited to announce some big improvements to 3D Tiles streaming per...