APIs are the backbone of modern applications, and their performance is crucial for user experience.
The guide provides 5 advanced steps to debug a slow API, including measuring performance with logging and profiling, checking for database bottlenecks, analyzing network and latency, optimizing code logic and third-party integrations, and scaling and load testing the API.
Pro tips and tools are given for each step, such as using detailed logging, analyzing query performance, optimizing payload size, and using load testing tools like Apache JMeter and Artillery.
The importance of continuous monitoring, A/B testing, and setting alerts for threshold breaches is emphasized.