Everybody is good, I use a MongoDB3.2.8 version, there are 200 w data, in the mongo shell query 33 w data only 400 ms, but the official driver in c # (2.2.4) query, need 200 s +, please everyone a great god, is this why??? The gap is too big ah, ah, genuflect is begged bothers me for a few days, only 20 points, don't abandon oh

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Part attached screenshot

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Jacked up!!!!! Don't sink!

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To help the top
Well, I'm afraid yo, difficult to integrate?

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Database connection will consume time, MongoDatabase singleton pattern, get only once, and consumption are on this side,

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330000 data of a query, serialized objects into memory, must be very slow,
Shell tool, must will code quickly, is inevitable.

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Commonly used to give some retrieval fields indexed

 db. Collectionname. EnsureIndex ({fieldName: 1}, {name: 'IX_fieldName}) 

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You should only check the count number, see also not slow?