No, the original sentence has a different meaning than the rephrases. They learn so fast (that) they find ordinary lessons boring. (No comma, and the implied word "that" is now included).
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Bob2010They learn so fast, they find ordinary lessons boring.The implied that is crucial. so goes with that.
Doctor D#2 almost suggests the reverse meaning, that because the original lessons are boring, they learn much faster!It's an interesting comment.
TicceThey learn so fast finding ordinary lessons boring.The more typical form is reversed and without so:
Could you give some more examples of a similar construction?