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Pro Provides a very detailed analysis report
Like all of its competitors GTMetrix also does provide an extremely detailed report of its findings, which include a really useful waterfall feature and the famous and extremely informative YSlow website speed grading as well.
Pro Compare results with other websites
GTMetrix allows you to compare your site's speed reports with those of upto 4 other websites.
Pro Supports location based testing
GTMetrix.com have their servers in a number of countries, these give you the freedom to profile your website from the location where most of your traffic originates from