Don's note
Every restaurant owner who has ever run their site through PageSpeed Insights has seen a number — 34, 61, 88 — and wondered what it means. The honest answer: it's Google's weighted roll-up of how quickly the page's main content paints, how stable the layout is while it loads, and how responsive the page feels while the browser is still working. Each of those has a definition and a weight, and once you know them, the score stops feeling like a black box.
For a restaurant site, the practical implication is that two metrics account for roughly 55% of the score — Largest Contentful Paint and Total Blocking Time. Fix those two and everything else follows. The audit tool on this site returns the per-metric breakdown so you can see exactly which bucket is dragging your score down.
Poor0–49
Needs work50–89
Good90–100
Key findings
- The Lighthouse performance score is a weighted average of five metrics (as of the current major version): First Contentful Paint, Speed Index, Largest Contentful Paint, Total Blocking Time, and Cumulative Layout Shift.
- Current weights: FCP 10%, SI 10%, LCP 25%, TBT 30%, CLS 25%. TBT and LCP together account for over half the final number; optimizing them moves the score the most.
- Each metric is scored against a log-normal curve built from the top ~10% of real-world sites on the HTTP Archive. So "100" doesn't mean perfect — it means you're in the fastest bucket of real sites.
- Scores above 90 are "Good," 50–89 are "Needs improvement," and below 50 is "Poor." The colored dial in the report maps to these thresholds.
- Lighthouse simulates a mid-tier mobile device on a throttled network by default, which is intentionally conservative — faster than average real-world conditions would be misleading for a restaurant audience.
How Muntin uses this
- Wix vs. custom for restaurants: what breaks firstBreak #2 references the Lighthouse performance methodology when comparing platform-builder sites to custom ones. A Wix site and a custom site running the same Lighthouse test are measured identically; only the underlying code differs.
- Restaurant Website Audit (interactive tool)Muntin's audit runs against real PageSpeed Insights data for your URL and reports the component metrics that make up the Lighthouse score, not just the final number.
Full citation
Chrome DevTools. Lighthouse performance scoring. Chrome for Developers documentation. developer.chrome.com
Last reviewed: April 2026 — Lighthouse metric weights have shifted slightly across major versions; Muntin reviews this page whenever a new Lighthouse major is released.