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Common thing for performers - they play faster on stage unless they're really disciplined (using a click track for timing or similar)

sounds like, everyone.

Doesn't it start as a schoolkid, where you too fast giving a presentation up at the board?

how can you not compress time in front of others unless you're practiced?

If I was playing on stage and there were 100 naked women waiting in the dressing room for me I'd speed it up a bit myself.

This era of Metallica was the greatest metal band that ever did or will exist.

Adrenaline and give and take of the energy of the crowd. For someone like Metallica nowadays it might also be making sure you get through the setlist before the cost of the venue and staff doubles.