This tool analyzes whether the images loaded on a page are optimally delivered and optimized when it comes to page speed. It checks whether:
Perfecting the image delivery and optimization can make a huge difference in page speed especially if there are many images/photos on a page. Compressing images can save a lot of disk space which can in turn speed up page load times. Using a CSS sprite to display multiple images at once with one image request will result in fewer http requests. Pre-setting the dimensions of images with CSS or HTML will result in quicker rendering of the page.
Analyze your CSS to make improvements to the CSS Delivery.
Minimize CSS scripts and files for page speed.
Minify your JS files and scripts to maximize performance.
Check whether your web pages have Gzip compression enabled.
Tests your image delivery so you can improve it.
Reduce your PNG image filesize while keeping quality.
Play with the quality and size of JPEGs to save disk space.
Place multiple images in one image to make fewer requests.
Check how and whether your website files are cached.
Test your web pages for broken links and requests.
How many HTTP requests do your web pages produce?
Encode JPEG and other files into a Base64 string.
Check whether your website has keep-alive settings as enabled.
Remove line breaks from your scripts to save disk space.
Check the HTTP server header of your site.