How does Babylon load point cloud data in .bin format or .las format
Are you asking if it does and how does it to do, or how you can achieve that?
What I want to ask is how to do it, what I want is to read the binary file first, and then render the points as particles, but this feels like a lot of performance consumption.
Well, that depends on the file format, the decoder you have and a few other factors. That’s a very abstract question TBH 
If you know the file format you can write a simple decoder yourself. You can consume the file as an array buffer instead of a string and process it as you see fit
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