Matan · Performance · Payload
Render-blocking resources (Performance)
Classic <script src> in <head> without async/defer and extra stylesheets delay first paint and LCP.
Pass condition in our engine: At most two render-blocking scripts in <head> and at most two blocking stylesheets.
This Performance check is part of SEO-GEO scoring 2.2.1, last updated 2026-09-18. About 90 percent of the evaluation runs on the HTML we crawl, so you can verify the same pass condition with a free report.
1. Problem description
The parser stops to download and run blocking scripts. Two or three blocking files are common; more is a smell.
2. Most common causes
- A tag manager loaded synchronously.
- One CSS file per component.
- jQuery in the head.
3. How to fix it
- Add defer or type=module.
- Combine or inline critical CSS.
- Move analytics below the fold.
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