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# Poor Performance | ||
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In this document you can learn about how to profile a Node.js process. | ||
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- [Poor Performance](#poor-performance) | ||
- [My application has a poor performance](#my-application-has-a-poor-performance) | ||
- [Symptoms](#symptoms) | ||
- [Debugging](#debugging) | ||
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## My application has a poor performance | ||
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### Symptoms | ||
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My applications latency is high and I have already confirmed that the bottleneck | ||
is not my dependencies like databases and downstream services. So I suspect that | ||
my application spends significant time to run code or process information. | ||
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You are satisfied with your application performance in general but would like to | ||
understand which part of our application can be improved to run faster or more | ||
efficient. It can be useful when we want to improve the user experience or save | ||
computation cost. | ||
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### Debugging | ||
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In this use-case, we are interested in code pieces that use more CPU cycles than | ||
the others. When we do this locally, we usually try to optimize our code. | ||
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- [Using V8 Profiler](./step1/using_v8_profiler.md) | ||
- [Using Linux Perf](./step2/using_linux_perf.md) | ||
- [Using Native Tools](./step3/using_native_tools.md) | ||
See: https://github.com/nodejs/nodejs.org/tree/main/locale/en/docs/guides/diagnostics/poor-performance |
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