Dynamic Shape Drawing On The Globe Live Preview Delay

Hello, I am using React/Resium in a project where I am allowing the user to create shapes dynamically on the globe. With Resium, I am using RectangleGraphics api; however, when a user clicks on the globe to start creating a shape, the live preview of the shape has a very serious delay - so much so that it creates a poor user experience. There’s probably about a half second delay from moving the mouse to where the shape is actually rendered on the screen. I’ve tried using the Primitive api to create a rectangle but have had the exact same results.

Is this a known issue? In the sandcastle examples that Cesium has posted, dynamic shape creation is not shown (at least I haven’t found it).

Can you post a Sandcastle with example code?