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title: Latency, Streaming and Product Design
seo_title: Latency, Streaming and Product Design — video
description: TTFT, streaming and perceived-latency thresholds in reasoning models. RouteLLM, design patterns and production session-cost management.
keywords: AI latency, TTFT, LLM streaming, RouteLLM, test-time compute product, perceived latency, AI response time, AI SLO, speculative decoding
date: '2026-04-11T00:00:00+00:00'
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    <div class="s5-video-watch__crumbs"><a href="https://5sigmas.com/en/videos/">All videos</a><span>Reasoning</span><span>0:59</span></div>
    <h1>Latency, Streaming and Product Design</h1><p>TTFT, streaming and perceived-latency thresholds in reasoning models. RouteLLM, design patterns and production session-cost management.</p>
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    <div class="s5-video-watch__section-head"><span class="s5-eyebrow">Video summary</span><h2 id="video-summary-title">The ideas to retain</h2></div>
    <div class="s5-video-watch__snippet-grid"><article><span>01</span><h2>1. Perceived-latency thresholds</h2><p>User-experience research has studied for decades how latency affects perception. Jakob Nielsen established a scale in the 1990s that remains relevant:</p></article>
<article><span>02</span><h2>Dynamic routing: RouteLLM</h2><p>A relevant pattern in this context is dynamic routing, formulated as a technique under the name RouteLLM (Ong et al., 2024): instead of applying the most capable (and slowest) model to…</p></article>
<article><span>03</span><h2>2. Streaming and the perception of latency</h2><p>Streaming—sending tokens to the client as they are generated instead of waiting for the complete response—is the most widely used tool for improving perceived latency without reducing…</p></article></div>
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  <aside class="s5-video-watch__source"><div><span class="s5-eyebrow">Context and evidence</span><h2>Continue with the full article</h2><p>The chapter develops the mechanism, primary sources, limitations and connections to the rest of the series.</p></div><a class="s5-video-watch__source-link" href="https://5sigmas.com/en/series/modelos-razonadores/04-latencia-streaming/">Read the article →</a></aside>
  <section class="s5-video-watch__related" aria-labelledby="related-videos-title"><div class="s5-video-watch__section-head"><span class="s5-eyebrow">Next step</span><h2 id="related-videos-title">Related videos</h2></div><div class="s5-video-watch__related-grid"><article><a href="https://5sigmas.com/en/videos/series/modelos-razonadores/05-riesgos/"><img src="https://5sigmas.com/en/series/modelos-razonadores/05-riesgos.jpg" alt="" loading="lazy" width="1280" height="720"><span>Reasoning · 1:00</span><strong>Reasoning Risks and Production Controls</strong></a></article>
<article><a href="https://5sigmas.com/en/videos/series/modelos-razonadores/03-test-time-compute/"><img src="https://5sigmas.com/en/series/modelos-razonadores/03-test-time-compute.jpg" alt="" loading="lazy" width="1280" height="720"><span>Reasoning · 1:00</span><strong>Test-Time Compute</strong></a></article>
<article><a href="https://5sigmas.com/en/videos/series/modelos-razonadores/02-fallos/"><img src="https://5sigmas.com/en/series/modelos-razonadores/02-fallos.jpg" alt="" loading="lazy" width="1280" height="720"><span>Reasoning · 0:59</span><strong>How Reasoning Fails</strong></a></article></div></section>
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