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well its always preferred that buffers should be as large as possible in networking.

but can having a very large buffer or a long buffer be a disadvantage?

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A downside to larger buffers is that they can cause the appearance of "lag," because the buffer has to hit a high water mark before it gets sent. I would not say "it's always preferred."

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A recent posting about possible causes of a certain wireless carriers issues covers this in great detail. It's a good read and answers this pretty clearly:

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