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PerformanceImportant

HTML over 1 MB

Large HTML slows down the first render, especially on mobile.

4.8%of Global websites

By market

  1. Global4.8%
  2. United Kingdom5.4%
  3. Netherlands4.5%
  4. Italy5%
  5. Spain4.9%
  6. Japan1.8%
  7. Latin America7.9%

Examples

Popular sites where we saw this on the homepage (at crawl time).

cloudflare.comyoutu.beworkers.devvimeo.comt-online.detheguardian.compages.devcnn.comwixsite.comsalesforce.comautodesk.comgmail.com

How to fix

  1. 1Move inline data and SVG out of the HTML.
  2. 2Paginate long lists.

Related mistakes

Our crawler: 68,769 sites · Global · updated Oct 23, 2026 · Methodology

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