How does S21 face unlock work?

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I currently use a Pixel 4XL and I’m on the verge of buying an S21 Ultra. I haven’t had a Samsung phone in years.

How does the S21 face unlock work compared to the Pixel 4XL? As far as I can tell, it only has the one camera on the front. I read something about iris scanning on the S20. Is that part of it on the S21?

Also, does anyone know what making it faster does? I noticed that is a setting. I mean, I assume it makes it faster but how?

Thanks!

(simply can’t find this on the web, maybe I am not searching right)

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