p50, p95, p99: What Latency Percentiles Actually Mean for Your Node.js App

Your monitoring dashboard shows average response time: 45ms. Looks great. Your users are complaining the app is slow. Both things are true. Here's why. Imagine 100 API requests. 99 of them take 10ms. One takes 5000ms. Average: (99 × 10 + 5000) / 100 = 59.9ms Your dashboard shows ~60ms average. Looks

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