--- title: "Review Schema Lost in Migration: 57.1% of Sites Drop It" url: https://www.pagespeedmatters.com/resources/data-studies/review-schema-lost-in-migration description: "Of 217 homepages with AggregateRating markup before a platform switch, 57.1% had none after. Moves to Shopify lost it most often, at 68.3% of 60 sites." lang: en --- Data Study ยท Website Migration # Review Schema Lost in Migration: 57.1% of Sites Drop It Of 217 top 1M homepages with AggregateRating markup the month before a platform switch, 57.1% had none the month after. - 217 switcher homepages - HTTP Archive, Sept 2026 Matt Suffoletto: https://www.pagespeedmatters.com/resources/author/matt-suffoletto Founder, PageSpeed Matters Published Oct. 19, 2026 4 min read ## Key Findings 1. **57.1%** of 217 homepages with AggregateRating structured data the month before a platform switch had none the month after. Copy stat 2. Moves to Shopify dropped review markup most often (**68.3%** of 60 homepages), against **49.0%** of 100 moving to Next.js. Copy stat 3. By previous platform, **60.0%** of 35 sites leaving Magento and **57.8%** of 45 leaving WordPress lost it. Copy stat 4. Losses are rarely made up by new markup: only **2.7%** of 1,472 Shopify arrivals without AggregateRating had it after the move, and **2.2%** of 1,404 Next.js arrivals. Copy stat 5. Product markup goes the same way: **81.3%** of 171 homepages with Product structured data before the switch had none after. Copy stat Homepages that lost AggregateRating markup after a switch Moved to Shopify (60) 68.3% Left Magento (35) 60% Left WordPress (45) 57.8% Moved to Next.js (100) 49% Source: PageSpeed Matters. HTTP Archive top 1M monthly crawls, Sept 2024 to Sept 2026. Small groups of 35 to 100 sites each, homepage only. In this study ## Homepages that lose AggregateRating markup after a platform switch | Group | Lost AggregateRating | Sites with it before | | --- | --- | --- | | Moved to Shopify | 68.3% | 60 | | Left Magento | 60.0% | 35 | | Left WordPress | 57.8% | 45 | | Moved to Next.js | 49.0% | 100 | | All switchers | 57.1% | 217 | Source: PageSpeed Matters, Sept 2026. Groups overlap: a site can appear under both its old and new platform. ## Summary AggregateRating markup tells search engines a page's average review score and review count. It is one of the structured data types that can make a site eligible for review stars in search results, and it is easy to lose in a rebuild because it often comes from a reviews app, plugin or template that does not carry over. We checked how often it survives a platform switch. Of 217 top 1M homepages with AggregateRating markup the month before a switch, 57.1% had none the month after. ## What we measured We used HTTP Archive monthly crawls of the top 1M sites from September 2024 to September 2026. A site counts as switching platform when it ran on one platform for 3 or more months and then on another for 3 or more months. We compared the structured data types on each homepage in the month before the switch with the month after. This is a short study. The base is 217 homepages, and only four breakdown groups reach 30 sites (35 to 100 each), so the group results are indicative. We checked homepages only, not product or review pages. The base covers every switcher with the markup, not only ecommerce platforms, so we call them sites rather than stores. ## More than half of sites drop review markup 57.1% of the 217 homepages that had AggregateRating structured data before a switch had none after it. Moves to Shopify dropped it most often, at 68.3% of 60 homepages, against 49.0% of 100 homepages moving to Next.js. By previous platform, 60.0% of 35 sites leaving Magento and 57.8% of 45 leaving WordPress lost it. New markup rarely makes up the loss. Only 2.7% of 1,472 sites that arrived on Shopify without AggregateRating had it after the move, and 2.2% of 1,404 Next.js arrivals. So the sites that lose review markup are not balanced out by sites that gain it. Product markup goes the same way. 81.3% of 171 homepages with Product structured data before the switch had none after. Review and product markup often come from the same templates and apps, so when those are rebuilt, both likely go together. 57.1% Share of 217 top 1M homepages with AggregateRating markup before a platform switch that had none the month after. ## What this means for your site Before a migration, list every structured data type your key templates output, including AggregateRating, Review and Product, and note which app or plugin produces each one. Make the new platform's reviews app and templates part of the launch checklist, not a later task. After launch, test your homepage and your main product and review pages with Google's Rich Results Test, and watch the rich result reports in Search Console for the following weeks. If review markup is missing, it is often one app setting or one template change to restore. ## Sources - HTTP Archive monthly crawls, top 1M sites, September 2024 to September 2026 - Google Search Central, review snippet structured data: https://developers.google.com/search/docs/appearance/structured-data/review-snippet - Schema.org, AggregateRating: https://schema.org/AggregateRating ## Embed this research Paste this on your site to embed the chart. It links back to the source automatically.

Source: Review Schema Lost in Migration: 57.1% of Sites Drop It - PageSpeed Matters

## Frequently asked questions ### Do sites lose review schema when they migrate platforms? Often. Of 217 top 1M homepages with AggregateRating markup the month before a platform switch, 57.1% had none the month after. ### Which platform moves lose review markup most often? In our small sample, moves to Shopify lost it most often, at 68.3% of 60 homepages, against 49.0% of 100 moving to Next.js. 60.0% of 35 sites leaving Magento and 57.8% of 45 leaving WordPress lost it. ### How do I check if my review markup survived a migration? Run your homepage and key product pages through Google's Rich Results Test and check Search Console's rich result reports. In our data, only 2.7% of Shopify arrivals without AggregateRating gained it after the move, so review markup rarely appears on a new platform on its own. Review markup is usually one app or template setting away from coming back, and it is far easier to keep through a launch than to rebuild after. Need help with this? See our ecommerce migration services (https://www.pagespeedmatters.com/services/ecommerce-migration). Share How we measured ## Methodology & Source Data source HTTP Archive monthly crawls of the top 1M sites Collection date September 2026 Sample 217 switcher homepages Release HTTP Archive, Sept 2026 Monthly crawls from September 2024 to September 2026. A platform switch means 3+ months on one platform, then 3+ months on another. We compared homepage structured data types the month before the switch with the month after. Short study: 217 homepages, and only four breakdown groups reach 30 sites (35 to 100 each). Homepage only. The base covers every switcher with the markup, not only ecommerce platforms. Using this data? ## Cite this study Link back to the study when you cite it. APA Matt Suffoletto. (2026). Review Schema Lost in Migration: 57.1% of Sites Drop It. PageSpeed Matters. https://www.pagespeedmatters.com/resources/data-studies/review-schema-lost-in-migration Plain link Review Schema Lost in Migration: 57.1% of Sites Drop It - PageSpeed Matters - https://www.pagespeedmatters.com/resources/data-studies/review-schema-lost-in-migration ## Related studies - Website Migration Migration Schema Loss 2026: 24.7% Drop Structured Data: https://www.pagespeedmatters.com/resources/data-studies/migration-schema-loss - Website Migration Migration Hreflang Loss: 31.6% Drop It After Launch: https://www.pagespeedmatters.com/resources/data-studies/migration-hreflang-loss - Website Migration Migration Analytics Loss: 11.2% of Sites Drop Their Google Tag: https://www.pagespeedmatters.com/resources/data-studies/migration-analytics-loss - Website Migration Internal Links After Migration: 19.0% Lose Half: https://www.pagespeedmatters.com/resources/data-studies/internal-links-after-migration ## Ready to Get Started? Get your site optimized in as little as 3 days. From $500. See Plans & Pricing: https://www.pagespeedmatters.com/pricing ## Structured data ```json [ { "@context": "https://schema.org", "@type": "Article", "headline": "Review Schema Lost in Migration: 57.1% of Sites Drop It", "datePublished": "2026-10-19", "dateModified": "2026-10-19", "author": { "@type": "Person", "name": "Matt Suffoletto", "jobTitle": "Performance Optimization Expert", "url": "https://www.pagespeedmatters.com/resources/author/matt-suffoletto" } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.pagespeedmatters.com/" }, { "@type": "ListItem", "position": 2, "name": "Resources", "item": "https://www.pagespeedmatters.com/resources" }, { "@type": "ListItem", "position": 3, "name": "Data Studies", "item": "https://www.pagespeedmatters.com/resources/data-studies" }, { "@type": "ListItem", "position": 4, "name": "Review Schema Lost in Migration: 57.1% of Sites Drop It" } ] }, { "@context": "https://schema.org", "@type": "Dataset", "name": "Review Schema Lost in Migration: 57.1% of Sites Drop It", "description": "Of 217 homepages with AggregateRating markup before a platform switch, 57.1% had none after. Moves to Shopify lost it most often, at 68.3% of 60 sites.", "url": "https://www.pagespeedmatters.com/resources/data-studies/review-schema-lost-in-migration", "creator": { "@type": "Organization", "name": "PageSpeed Matters", "url": "https://www.pagespeedmatters.com" }, "datePublished": "2026-10-19", "dateModified": "2026-10-19", "license": "https://creativecommons.org/licenses/by/4.0/", "isAccessibleForFree": true, "creativeWorkStatus": "Published", "variableMeasured": "Core Web Vitals pass rate and web performance metrics", "measurementTechnique": "HTTP Archive monthly crawls of the top 1M sites" }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Do sites lose review schema when they migrate platforms?", "acceptedAnswer": { "@type": "Answer", "text": "Often. Of 217 top 1M homepages with AggregateRating markup the month before a platform switch, 57.1% had none the month after." } }, { "@type": "Question", "name": "Which platform moves lose review markup most often?", "acceptedAnswer": { "@type": "Answer", "text": "In our small sample, moves to Shopify lost it most often, at 68.3% of 60 homepages, against 49.0% of 100 moving to Next.js. 60.0% of 35 sites leaving Magento and 57.8% of 45 leaving WordPress lost it." } }, { "@type": "Question", "name": "How do I check if my review markup survived a migration?", "acceptedAnswer": { "@type": "Answer", "text": "Run your homepage and key product pages through Google's Rich Results Test and check Search Console's rich result reports. In our data, only 2.7% of Shopify arrivals without AggregateRating gained it after the move, so review markup rarely appears on a new platform on its own." } } ] } ] ```