LLM Latency Optimization: KV-Cache, Speculative Decoding, Batching

Latency is UX and cost — especially for interactive assistants. A 3-second TTFT feels like a hang to most users; a 300 ms TTFT feels instant. At the same time, each optimization technique (batching, speculative decoding, KV-cache sharing) carries correctness, privacy, and quality trade-offs that a senior engineer must be able to articulate and defend.

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