Direct Answer
Aim for Largest Contentful Paint under 2.5 seconds, First Input Delay under 100ms, and Cumulative Layout Shift under 0.1 — Google's Core Web Vitals thresholds. On 4G mobile, total page weight should be under 1.5 MB and Time to Interactive under 3.8 seconds.
Voice answer (≤30 words)
“A fast website loads in under two and a half seconds with stable layout. That meets Google's Core Web Vitals.”
Portent's 2022 study of 27 billion sessions found conversion drops 4.42% for every additional second of load time between 0 and 5 seconds.
53% of mobile users abandon a site that takes longer than 3 seconds to load (Google/SOASTA mobile speed benchmark).
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