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Website owners, your Google search rankings can be hurt by slow JavaScript on your site. The PageSpeed Insights report is a great tool to identify such problems.
The report can be used to identify JavaScript that is blocking the rendering of pages, identify JavaScript that is downloaded, but never executed, identify JavaScript that is slow to execute, and much more.
Go to pagespeed.web.dev and enter the URL of one of the pages on your site and start digging.
