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Speculation Rules API

1 post about Speculation Rules API. Every summary links to the original.

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Etsy
Improving performance by prefetching product pages from Etsy Search
Etsy’s search and web performance teams tested the Speculation Rules API (SRA) to reduce loading time for product listing pages reached from desktop organic search. They added a speculationrules configuration that prefetches eligible listing HTML after a 200-millisecond hover, using URL and data-attribute selectors with moderate eagerness; unlike link prefetch, SRA uses both memory and HTTP caches. The experiment required attention to a two-page memory limit, five-minute retention, non-cacheable listing HTML, video hover behavior, cookies, new-tab targets, and analytics events triggered during prefetches. Results showed 23.6% faster 75th-percentile TTFB, with improvements of 20.7% in FCP, 21.1% in LCP, 20.4% in DOMContentLoaded, and 10.6% in Page Load, while roughly one in 14 prefetches led to navigation.

The best engineering reads, once a week.

Topic

1 post about Speculation Rules API. Every summary links to the original.

Paid picks we use ourselves. Links carry a referral code — a subscription through one earns us a commission at no extra cost to you.

Newest first

Etsy
Improving performance by prefetching product pages from Etsy Search
Etsy’s search and web performance teams tested the Speculation Rules API (SRA) to reduce loading time for product listing pages reached from desktop organic search. They added a speculationrules configuration that prefetches eligible listing HTML after a 200-millisecond hover, using URL and data-attribute selectors with moderate eagerness; unlike link prefetch, SRA uses both memory and HTTP caches. The experiment required attention to a two-page memory limit, five-minute retention, non-cacheable listing HTML, video hover behavior, cookies, new-tab targets, and analytics events triggered during prefetches. Results showed 23.6% faster 75th-percentile TTFB, with improvements of 20.7% in FCP, 21.1% in LCP, 20.4% in DOMContentLoaded, and 10.6% in Page Load, while roughly one in 14 prefetches led to navigation.

The best engineering reads, once a week.