Developers need to distinguish between Time To First Token (TTFT) and total latency when evaluating LLM performance in streaming applications. While total latency measures the entire response duration, TTFT captures the user's perceived responsiveness by measuring the time until the first word appears. For chat interfaces, a low TTFT is crucial for a good user experience, even if the total response time is longer. Proper instrumentation should track these distinct metrics to avoid misinterpreting dashboard data and to accurately assess user-facing performance. AI
IMPACT Developers can improve user experience in streaming LLM applications by accurately measuring and optimizing Time To First Token (TTFT).
RANK_REASON The article discusses a specific technical implementation detail for instrumenting LLM streaming responses, which is a tool-level concern.
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