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The normal (slow) recovery works by entering the seed into the device in a similar fashion to how entering the PIN works. This means that your seed is safe even if you for example have a key logger on your computer.
The fast option is not something I would recommend using, and involves typing the seed using your computer’s keyboard. This can potentially leak your seed if your computer is compromised and therefore defeats some of the purpose for having a Trezor in the first place, so definitely take the extra time to do it properly.