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Google pagespeed insights checker will check your webpage Speed Score analysis, your page code and gives you most useful page optimization suggestions. This tool is among the most important Google ranking factors, and every webmaster must focus on improving their site's speed.
According to surveys, more than 45% of people expect a web page to load in less than 2 seconds, and 40% leave a web page if it takes more than 3 seconds to load! So it becomes really important for every webmaster to reduce their site's loading time. Google thinks site speed is most important.
Google introduced their Pagespeed Insights tool in 2011 to provide a measurement and recommended improvements to slow loading pages.