Details
Major - P3 Description
Serializing long string is very slow in tojson(). Calling tojson() takes about 15 seconds for a 16MB long string.
$ ./mongo --nodb
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MongoDB shell version v0.0.0
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> var start = Date.now(); tojson("x".repeat(16 * 1024 * 1024)); print(Date.now() - start)
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14320
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