Does site speed affect whether AI engines cite a page?

Site speed turns out to be one of the more underappreciated factors in whether AI engines cite you, and the effect is large. AI bots operate with strict compute budgets and timeouts in the range of one to five seconds, and rather than waiting around they abandon slow websites before indexing the content, frequently returning HTTP 499 timeout errors. In other words, a page that loads too slowly simply isn’t there by the time the crawler gives up. The data makes the gap concrete: pages with a First Contentful Paint under 0.4 seconds average 6.7 ChatGPT citations, whereas pages loading in over 1.13 seconds average just 2.15 — roughly a threefold difference that strongly suggests the retrieval crawler is enforcing a timeout and penalizing slow pages.

The practical implication is that speed is close to a prerequisite for AI visibility rather than a nice-to-have. ChatGPT’s browsing mode times out at around three to four seconds, so anything slower is skipped or only partially crawled, and sensible targets are a time-to-first-byte under 200 milliseconds, HTML payloads under a megabyte, and Core Web Vitals in the “good” range, meaning a Largest Contentful Paint under 2.5 seconds and Cumulative Layout Shift under 0.1. It’s also worth understanding why AI is stricter here than traditional search: Google can afford to render a page and retry, but AI crawlers running at scale under tight budgets cannot, which means a slow page can quietly lose citations it would still comfortably rank for on Google.