Limit number of rectangle entity

hello.

I would like to contact you because I have a question while measuring performance in the sandbox.
We measured FPS while increasing the number of square objects through the sandbox below.

However, when creating a 16K object, out of memory occurs, so I would like to inquire about the error.
At that time, RAM usage was about 60% and Chrome browser usage was 6GB.

I am also curious if there is a limit to the number of objects recommended by Cesium.

Laptop used for testing
CPU: i7-11800H
RAM: 32GB
GPU: RTX3060 Laptop