Find render-blocking resources in a built static site: head scripts without defer/async, heavy blocking CSS, @import chains, third-party blocking resources without preconnect, document.write, parser-blocking body scripts, print CSS without media, missing critical CSS. SARIF, GitHub Action. Zero deps.
performance async static-site fcp lcp critical-css defer github-action render-blocking core-web-vitals
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Updated
Oct 20, 2026 - JavaScript