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What would be your general advice for improving the performance of a Node app? Are there any patterns/antipatterns that come to your mind?
When I was at PayPal I worked on our Node app, but I never worked on performance issues myself, so I have limited knowledge to give you around performance and node. What I would say is make sure you have good monitoring in place so you can be made aware of performance issues and ensure you're optimizing the codepaths that are actually slow and don't just seem like they might be slow to you when you look at the code. Good luck!