Audit and fix render-blocking scripts to improve page load speed and Core Web Vitals.
- Audit and fix render-blocking scripts to improve page load speed and Core Web Vitals1 cited source1 category
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Why this matters
Render-blocking scripts delay page rendering, harming user experience and reducing search ranking potential.
Hypothetical standard operating procedure
Adapt this example to your site, access, tools, and change process. It is our suggested procedure, informed by the sources below.
- Use audits (e.g., Chrome DevTools) to identify render-blocking scripts in the <head>.
- Defer or async non-critical JavaScript loading.
- Replace blocking scripts with asynchronous alternatives where possible.
- Review impact on page rendering time and Core Web Vitals.
- Retest periodically after code changes.
Watch for
Excessive blocking scripts increase Largest Contentful Paint time and cause layout shifts.
Definition of done
Page loads under performance thresholds with zero or minimized render-blocking resources, verified by performance audits.
Sources & attribution
Original checklist wording and example SOP by Best SEO Checklist, using source-grounded AI assistance. Editorial contact: Ted Kubaitis, @tedkubaitis on Teams. Check current source guidance before implementation.