---
title: "Post-Migration Sitemaps: 1.7x More Bad URLs Than Average - PageSpeed Matters"
url: https://www.pagespeedmatters.com/resources/data-studies/post-migration-sitemaps
description: "On redirects and client errors, 7.3% of sampled sitemap URLs on 361 replatformed sites are bad, against 4.3% on 219 comparison sites, a 1.7x gap. Adding canonical and noindex checks on a subsample, 11.4% of listed URLs should not be in the sitemap."
lang: en
---

Post-Migration Sitemaps: 1.7x More Bad URLs Than Average (https://www.pagespeedmatters.com/resources/data-studies/post-migration-sitemaps)

On redirects and client errors, 7.3% of sampled sitemap URLs on 361 replatformed sites are bad, against 4.3% on 219 comparison sites, a 1.7x gap. Adding canonical and noindex checks on a subsample, 11.4% of listed URLs should not be in the sitemap.

Sitemap URLs that redirect or error, switchers vs full-crawl sites

Platform switchers (361 sites) 7.3%

Full-crawl sites (219) 4.3%

Source: PageSpeed Matters, Oct 2026. Sitemap URLs requested without following redirects.

Redirects and client errors only; canonical and noindex are not included.

Source: Post-Migration Sitemaps: 1.7x More Bad URLs Than Average - PageSpeed Matters (https://www.pagespeedmatters.com/resources/data-studies/post-migration-sitemaps)