Website Grader - Grade your website's strengths and weaknesses in seconds.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
PageSpeed Ninja - One-click page speed boost for WordPress
Big Photo - Overcome the image resolution limit on iOS devices
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.
Bandwidth Hero - Browser extension which saves data by compressing images