How Google Search uses speculation rules

Google Search is one of the most popular sites on the web, and also one of the fastest. The Search team is continually investing in making the search experience faster. On a page as popular as Google Search, even milliseconds of improvement quickly add up! That interest in speed includes the well-known Google home page, the Search Engine Results Page (SERP), and clicks to other sites from those search results.

Google Search has been making use of the Speculation Rules API to improve navigation speed from the search results page to the result links and they’ve been using a few features of the API that may be of interest to other site owners.

Source: How Google Search uses speculation rules