I've seen the same kind of demoes- there is a bit of a slowdown, but for someone trained and conditioned to wear the armor, its not going to be that noticeable. The real issue with such armor is going to be endurance.
If you look at history, the average soldier has been loaded down with 60-80lbs of gear. They're trained to carry it. Its mass is efficiently distributed. But the guys in plate, unlike some warriors of other cultures, could not drop significant portions of their gear to fight in. Additionally, that armor is not as good at allowing heat to escape as the fighting gear of other areas and eras, which also saps endurance.
If you look at history, the average soldier has been loaded down with 60-80lbs of gear. They're trained to carry it. Its mass is efficiently distributed. But the guys in plate, unlike some warriors of other cultures, could not drop significant portions of their gear to fight in. Additionally, that armor is not as good at allowing heat to escape as the fighting gear of other areas and eras, which also saps endurance.
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