Google’s Page Speed Online — which is a web-based adaptation of the popular Google Chrome web development browser extension, Page Speed — analyzes your website’s performance under Google’s Web Performance Best Practices (a set of rules for optimal front-end performance). You can gain lots of information from this handy web tool – it even includes a report for mobile device best practices for optimal performance.
Use PageSpeed Insights
Analyze your site performance with PageSpeed Insights you can id ways to make your site faster and more mobile-friendly.
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SEO