Synchronous JSON parsing can block Node.js application. See following test case - Chromium native parser can handle up to 44MB per second on my hardware. http://jsperf.com/json-parse-vs-1mb-json (BTW - I'm quite impressed by V8 garbage collector). http://jsperf.com/json-parse-vs-1mb-json
It's enough to perform easy DoS on reasonably configured low-end server. Anyway - I don't think that asynchronous parsing/stringifing would solve this problem (it can solve some perfomance issues in WebSockets-based games preventing frame-drop).
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