This will not only make your website faster but also save bandwidth.
Japplis Website Optimizer can also add the height, width and alt attribute to the images if missing.
It also contains a PHP optimization part.
It can also generate a .htaccess file to improve the caching of the website Apache Server.
Japplis Website Optimizer can run online and be deployed on an Intranet.
Japplis Website Optimizer is platform independent : runs on Windows, Linux, Mac OS X, OS/2, ... Follow the link and free download Japplis Website Optimizer For Mac