The State of Web Vitals

Total Blocking Time (lab)

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · All devices field outcomes
Metric LCP INP CLS
No data for Total Blocking Time (lab) this edition.
Related signals Main-thread CPU (lab) → Lab paint timeline → Document lifecycle (lab) → Chrome field data from 189,915 sites, representing millions of real page loads · How we measured
Live queries (1) — admin only
Query #1: 35.3 ms 
SELECT COUNT(*) AS count,
            quantile_disc(m.synthetic.tbt_ms, 0.10) AS p10,
            quantile_disc(m.synthetic.tbt_ms, 0.25) AS p25,
            quantile_disc(m.synthetic.tbt_ms, 0.50) AS p50,
            quantile_disc(m.synthetic.tbt_ms, 0.75) AS p75,
            quantile_disc(m.synthetic.tbt_ms, 0.90) AS p90,
            quantile_disc(m.synthetic.tbt_ms, 0.99) AS p99
            FROM sites WHERE m.synthetic.tbt_ms IS NOT NULL;
JSON file lookups (4)
20260625/meta.json 0.05 ms
20260625/types.json 0.63 ms
20260625/loaf-scripts.json 1.48 ms
20260625/menu.json 0.23 ms