1. A concise explanation of the problem you’re experiencing.
I load czml file,It has about 6k dynamic models(time-dependent),FPS is very low, I checked ‘3D Model instancing’ example in Sandcastle,it can load 10k models and maintain good performance，but it’s time-independent,
So how should I optimize performance?
2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
4. The Cesium version you’re using, your operating system and browser.
1.66