The loading time of the model of the scene is too long

The loading time of the model of the scene is too long. I want to set a progress bar to display the scene after all the models are loaded. Is there any API I can use?

For example, here is the demo - Babylon.js - Sponza demo
The code for progress bar is here Website/loader.js at master ยท BabylonJS/Website ยท GitHub

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Thank you !!!

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