https://wp-rocket.me/google-core-web-vitals-wordpress/legacy-javascript-insight/
Legacy JavaScript Insight Failed? How to Fix It (Step by Step)
Feb 9, 2026 - Getting the Legacy JavaScript warning in PageSpeed Insights? Learn what it means for your site's performance, and how you can fix it.
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https://www.screamingfrog.co.uk/seo-spider/issues/pagespeed/avoid-serving-legacy-javascript-to-modern-browsers/
Issues - PageSpeed : Legacy JavaScript | Screaming Frog
Oct 14, 2025 - Pages with legacy JavaScript. Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren’t necessary for modern...
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