A bottleneck is a phenomenon where the performance or capacity of an entire system is limited by a single or limited number of components or resources. The term bottleneck is taken from the 'assets are water' metaphor. As water is poured out of a bottle, the rate of outflow is limited by the width of the conduit of exit - that is, bottleneck.
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bottleneck A narrow entrance or passageway.
bottleneck The narrow portion near the opening of a bottle.