How does the "Practice Opening Drills" feature work?

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Jahtreezy

I've fiddled about with the opening drills under the Learn-Practice menu recently.  I've noticed the computer plays faster than the usual computer bot does, and it plays stronger moves (at least, according to my game reviews).  I've set it on 1000 to practice certain openings and it regularly evaluates the game over 1500.

Not a complaint, just curious: how does this feature on the website work?  Is it referencing GM games or particular theory lines to spit out moves faster?  Why does it seem to be stronger than playing against the same computer level in the Play-Computer menu?

Jahtreezy

Just bumping this to see if there are any insights on the question.