[docs] [issue12134] json.dump much slower than dumps

[poq]

poq <poq at gmx.com> added the comment:

dump() is not slower because it's incremental though. It's slower because it's pure Python. I don't think there is necessarily a memory/speed trade-off; it should be possible to write an incremental encoder in C as well.

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<http://bugs.python.org/issue12134>
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