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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
Not my experience. They are usually instant, but you need a flagship device, of course. Otherwise it's comparing apples and oranges.
The $1000 price tag on the Pixel tells me it's a flagship device and yet the scanner is still trash.
But optical scanners just suck in general. I wish they'd bring back the rear sensor, it was so convenient both for unlocking and for having a shortcut to pulling down the notification shade.