{"id":337,"slug":"research-brief-page-speed-moat","title":"Research brief: Page Speed as a Moat — why CWV separates the agencies from the freelancers (piece 9 of 15)","kind":"reference","scope":"business","status":"current","audiences":["kevin","claude-code","smb-owner","candid-team"],"topics":["core-web-vitals","measurement","agency-methodology"],"reference_body":"**Status:** Research material — not a finished article. Compiled May 2026.\n\n## TL;DR\n\n- **Core Web Vitals are necessary but not sufficient in 2026.** Google's official \"Good\" thresholds remain **LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1** (developers.google.com, last updated Dec 10, 2025). The widely-repeated SEO-blog claim that March 2026 tightened LCP to 2.0s and \"elevated\" INP is **unconfirmed by Google and contradicted by current documentation** — see [[march-2026-lcp-tightening-rumour-refuted]].\n- **More than half of the mobile web still fails CWV.** Web Almanac 2025: **48% mobile / 56% desktop** origins pass all three on July 2025 CrUX. LCP is the bottleneck (62% mobile good vs 77% INP, 81% CLS).\n- **The platform spread is the moat.** Duda 83.63%, Shopify 75.22%, Squarespace 67.66%, **WordPress 43.44%**. Elementor sub-segments perform worse (25-35%). Agencies who deliver durable CWV on WordPress — or skip it for Astro/Next.js/Hugo — are doing structural work that freelancers using stock themes cannot replicate.\n\n## Honest caveats\n\n- The \"March 2026 core update tightened LCP to 2.0s\" claim circulating across SEO blogs **traces to a single Digital Applied post citing a Search Central blog entry that does not exist**. Google docs as of Dec 10, 2025 still state 2.5s. Search Engine Roundtable confirmed (April 8, 2026) Google's only public communication was a Search Status Dashboard note. **Treat as unconfirmed rumour.**\n- CWV is **Chrome-only field data**. Safari only added LCP+INP in Safari 26.2 (Dec 2025). For iPhone-heavy demographics, CrUX may not represent your audience accurately.\n- Low-traffic SMB sites often show **no URL-level CrUX data** — Google falls back to origin-level. The moat may be invisible at very small scale.\n- Per Dan Taylor (Search Engine Land, Jan 13 2026, n=107,352): CWV is a *gate*, not a growth lever. **Severe failure suppresses AI Overview citation; \"Good\" → \"great\" does not lift it.** Correlations: LCP r=−0.12 to −0.18, CLS r=−0.05 to −0.09.","rationale_body":"CWV is the most overpromised technical-SEO area. This brief separates verified Google thresholds from SEO-blog rumour, anchors platform comparisons in primary HTTP Archive data, and gives Candid a defensible \"moat\" pitch grounded in evidence rather than vibes.","metadata":null,"links":{"outgoing":[{"slug":"cwv-thresholds-2026-confirmed-unchanged","title":"2026 CWV thresholds (confirmed unchanged): LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1 at p75 field data","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"march-2026-lcp-tightening-rumour-refuted","title":"REFUTED: \"March 2026 LCP tightened to 2.0s / INP elevated\" — no such Google announcement exists","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"web-almanac-2025-cwv-pass-rates","title":"Web Almanac 2025: 48% mobile / 56% desktop origins pass all 3 CWV; LCP is the bottleneck","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"web-almanac-2025-mobile-page-weight-2-56mb","title":"Web Almanac 2025: median mobile page weight crossed 2,559 KB in July 2025 (+7.8% YoY)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"vodafone-31pct-lcp-8pct-sales-2021","title":"Vodafone A/B test (2021): 31% LCP improvement → 8% more sales, 15% better lead-rate, 11% better cart-rate","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"deloitte-google-milliseconds-millions-2020","title":"Deloitte/Google \"Milliseconds Make Millions\" (2020): 0.1s improvement → 8.4% retail conversion lift, 10.1% travel","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"pinterest-pwa-60pct-faster-2017","title":"Pinterest PWA rebuild (2017, foundational): 60% faster → +40% conversions, +40% time spent, +44% ad revenue","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"walmart-100ms-1pct-revenue-foundational","title":"Walmart (2012, foundational): 100ms improvement = 1% incremental revenue; 1s improvement = 2% conversion increase","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"bbc-10pct-user-loss-per-second","title":"BBC: lost 10% of users for every additional second the site took to load","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"gtm-18-tags-20x-tbt-chrome-aurora","title":"Chrome Aurora team: Google Tag Manager with 18 tags increases Total Blocking Time ~20×","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"astro-vs-nextjs-40pct-faster-90pct-less-js","title":"Astro vs Next.js (eastondev benchmark, Dec 2025): ~40% faster, ~90% less JS for static content","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"dan-taylor-cwv-ai-citation-gate-not-signal-2026","title":"Dan Taylor (SE Land, Jan 13 2026, n=107,352): CWV is a gate for AI citation, not a growth lever","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"webp-25-34-smaller-than-jpeg-google-study","title":"Google WebP Compression Study: WebP is 25-34% smaller than JPEG at equivalent SSIM (avg ~30%)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"lcp-killers-catalogue","title":"Reference: the 8 most common LCP killers — ranked by observed frequency","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"inp-killers-catalogue","title":"Reference: the 8 most common INP killers — ranked by observed frequency","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"cls-killers-catalogue","title":"Reference: the 5 most common CLS killers — and the fixes","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"2026-performance-budget-smb-site","title":"Reference: 2026 performance budget — SMB marketing site (Candid default targets)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"rule-enforce-performance-budgets-in-ci","title":"RULE: Performance budgets enforced in CI. Build fails on budget violation. Documented budgets without CI enforcement do not work.","kind":"rule","scope":"business","link_type":"relates-to"},{"slug":"rule-defer-third-party-scripts-until-interaction","title":"RULE: Defer or delay every third-party script until user interaction, except those required for first paint","kind":"rule","scope":"business","link_type":"relates-to"},{"slug":"rule-preload-hero-image-with-fetchpriority","title":"RULE: The LCP image always has explicit width/height + fetchpriority=\"high\" + no lazy-loading","kind":"rule","scope":"business","link_type":"relates-to"},{"slug":"research-brief-marketing-sites-that-do-something","title":"Research brief: What makes a marketing site do something (piece on brochure vs platform)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"research-brief-built-to-last","title":"Research brief: Built to Last — why most SMB sites rebuild every 3-4 years (piece 5 of 15)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"platform-cwv-pass-rates-june-2025","title":"June 2025 platform CWV pass rates (SEJ): Duda 83.63%, Shopify 75.22%, Wix 70.76%, Squarespace 67.66%, Drupal 59.07%, WordPress 43.44%","kind":"reference","scope":"business","link_type":"relates-to"}],"incoming":[{"slug":"research-brief-case-against-page-builders","title":"Research brief: The Case Against Page Builders (piece 10 of 15)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"foundation-roadmap-15-pieces-closure","title":"CANDID REFERENCE: how the 15-brief foundation roadmap connects — the throughline from strategic frame to editorial layer","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"research-brief-2026-build-standards","title":"Research brief: Candid Creative 2026 Build-Standards — web stack decision framework for SMB marketing sites & lightweight apps (piece 16)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"research-brief-wp-builders-vs-modern-stacks-2026","title":"Research brief: WordPress + Page Builders vs Modern Custom Stacks — sourced performance comparison (piece 18)","kind":"reference","scope":"business","link_type":"depends-on"}]},"created_at":"2026-05-22T20:03:33.280Z","updated_at":"2026-05-22T20:03:33.280Z"}