<p>At work, I lead a team responsible for a Node.js service that serves a lot of GraphQL queries. We recently noticed some servers in the cluster were running much slower than others. We had used <a href="https://github.com/davidmarkclements/0x">0x</a> in the past to profile Node.js services locally. In this case, we could not identify the problem locally and needed a solution to profile Node.js in production to identify the cause of the slowdown.</p>
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