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How to reduce prompt latency and TTFT (Time To First Token) for real-time web applications?

Prompt Engineering & LLMs · 2 saved versions

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Edited by Ishaan Patel · Aug 23, 2026 5:05 PM

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How to reduce prompt latency and TTFT (Time To First Token) for real-time web applications?

Summary snapshot
Prompt caching, speculative decoding, and streaming responses over Server-Sent Events (SSE).
Content snapshot
### Latency Reduction Protocols 1. **Prompt Caching**: Structure system instructions and static context prefix identically across calls to hit LLM API prompt caches (up to 80% cost and latency drop). 2. **SSE Streaming**: Stream tokens directly to client UI via WebSockets or SSE for instant visual feedback. *Note: This question represents expanded technical inquiry iteration #2 within the Prompt Engineering & LLMs topic area.*
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https://developers.google.com/search/docs

Version 1 (Original Post)

Published by Ishaan Patel · Aug 9, 2026 5:37 AM

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Original Title

How to reduce prompt latency and TTFT (Time To First Token) for real-time web applications?

Original Summary
Prompt caching, speculative decoding, and streaming responses over Server-Sent Events (SSE).
Original Content
### Latency Reduction Protocols 1. **Prompt Caching**: Structure system instructions and static context prefix identically across calls to hit LLM API prompt caches (up to 80% cost and latency drop). 2. **SSE Streaming**: Stream tokens directly to client UI via WebSockets or SSE for instant visual feedback. *Note: This question represents expanded technical inquiry iteration #2 within the Prompt Engineering & LLMs topic area.*
Original Sources

https://developers.google.com/search/docs