There’s only one hole in the container, and air has to get in to occupy the space being freed up by the water coming out, so if you pour too fast you get a glob of water going out, then a similar amount of air getting sucked in, then a glob of water, etc. Yes, it would probably empty the container faster if you didn’t tilt it far enough to completely block the outlet, because then air can come in at the same time as the water leaves.
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