Node.js app has periodic slowness and/or timeouts (does not accept incoming requests)?

My guess is Mongoose. If you are storing large payloads in Mongo, Mongoose can be pretty slow due to how it builds the Mongoose objects. See https://github.com/LearnBoost/mongoose/issues/950 for more details on the problem.

If this is the problem you wouldn't see it in Mongo itself since the query returns quickly, but object instantiation could take 75x the query time.

You are heavily leaking memory, try setting every object to null as soon as you don't need it anymore! Read this.

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