Website Image Speed Test - Beautiful & easy free analysis of the images on your page
Web Load Speed Test - Test your website load speed from 6 locations at once
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.
Smaller - Make your websites load faster
Speedtest by Ookla - Measure your ISP's performance in a click
Image Speed Test - Analyze your website content & make it faster.