What's wrong with circular references? Listing 1. Another memory leak pattern Listing 2. Back to top. StrongLoop | Node.js Performance Tip of the Week: Managing Garbage Collection. In our last weekly performance tip, we discussed in detail how the Node.js event-loop works as the orchestrator of requests, events and callbacks. We also troubleshot a blocked event-loop which could wreck havoc on application performance. In this week’s post we’ll dive into the fundamentals of garbage collection (GC) in V8 and how it holds the “keys to the kingdom” in the optimization of Node applications.