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Tests https://gtmetrix.com/ http://www.webpagetest.org/ Speed is important - every second costs money. Every second of delay in page loading time can result in a 7% decrease of online sales.


I think you are looking for the Google page speed insight : https://developers.google.com/speed/pagespeed/insights/?hl=fr If you want more tool, i posted some in this post : Testing SEO website

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