Troubleshooting: High TTFT
High TTFT has a measurable cause — queueing, scheduling, cache, or cold starts. Here is how to find it.
Users wait seconds before the first token appears, p95 TTFT breaches SLA, and it got worse after a traffic or config change — TTFT problems are debuggable from the right metrics.
High TTFT on Kubernetes comes from request queueing (not enough replicas or capacity), batch and scheduling settings that delay prefill, prefix-cache misses on shared contexts, cold starts from scale-to-zero or new replicas, KV-cache pressure, or load balancing that ignores cache locality. We read TTFT/queue metrics, batch and scheduler settings, and cache-hit ratios, then tune batching, autoscaling signals, prefix caching, and (where available) KV-cache-aware routing such as GKE Inference Gateway or NVIDIA Dynamo to bring TTFT back under SLA.
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