The Latency Reality Check

• ✓Explain why prefill is fast and decode is slow, and what that means for any "sub-200ms" claim
• ✓Tell perceived latency (streaming) apart from real latency and throughput (batching)
• ✓Sum a multi-hop chain's real total latency instead of trusting any single hop's number
• ✓Write a latency memo with the corrected chain and the three questions that catch an inflated claim

Catch a vendor's speed promise before a client signs off on it — turn "basically instant" into the real chain, the real total, and the specific question that would have caught the gap.