MS ImageCompressor is a Joomla! package that'll search images on your website and compresses them for you. We use a self-hosted service to reduce waiting times.
We can reduce your image sizes up to 75% without losing quality. We use a lossless algorithm that minifies the image but leaves the quality. You'll save megabytes of data on your server and reduce page loading times.
Google has a lot of criticism on websites with unoptimized images. Using MS ImageCompressor you can minify the images automaticly using a cron-job.