I'd like to use MongoDB as a message broker by taking advantage of capped collections and tailed cursors. I ran in to an odd behavior of the Node.js driver when compared to the C++, Python, and Ruby drivers. Messages do not seem to be delivered in the order they are sent. Odd latency patterns emerge when using the Node.js driver that are not present with the other drivers.

I have documented my research and findings on GitHub:
https://github.com/clayzermk1/mongodb-capped-tailed-benchmarks

Thank you for your time and for creating such a useful tool! <3 Node.js + MongoDB