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Bottleneck literally refers to the narrowed portion (neck) of a bottle near its opening, which limit the rate of outflow, and may describe any object of a similar shape. The literal neck of a bottle was originally used to play what is now known as slide guitar.

Bottleneck as an allegory for memory and selective amnesia in ("The largest part is lost", "Periit pars maxima") in the Emblemas Morales by Juan de Horozco (1591)

Metaphorically, the term may also be used as an analogy for any of the following implications of rate limitation or function restriction:




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