Why First Token Latency Determines User Experience
Users don't perceive throughput. They perceive the silence before the first token appears. TTFT is the metric that determines whether your app feels fast.
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Calculating End-to-End Latency Correctly
E2EL = TTFT + generation time sounds simple. But where does that time actually go? Understanding the equation reveals where to optimize.
Four Metrics That Actually Matter for LLM Inference
Your monitoring dashboard shows 180ms average latency. Your users say the app is slow. Both are telling the truth. The disconnect is what you're measuring.