demo · v141

Desktop Eager Tuning

Pick an eagerness level and hover the links below. The timer shows how long Chrome's eager-mode trigger threshold has changed — and on desktop it's now noticeably shorter than the moderate threshold, where before it was effectively zero.

probing HTMLScriptElement.supports("speculationrules")…

the rule

<script type="speculationrules">
{
  "prerender": [{
    "where": { "selector_matches": "a[href^='/']" },
    "eagerness": "eager"
  }]
}
</script>

// In Chrome 141, "eager" on desktop becomes "shorter than moderate
// hover" — not "fire immediately". That used to be the
// "immediate" behaviour. The new threshold is roughly 50-80 ms hover.

see also