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Website Grader - Grade your website's strengths and weaknesses in seconds.
Website Image Speed Test - Beautiful & easy free analysis of the images on your page
PageSpeed Ninja - One-click page speed boost for WordPress
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
WebSite Auditor - The techie's SEO spider: find site issues other tools miss
Global Website Speed Test - Test website load speed from 18 cities, including 3 in China