This will be relating to CSS Sprites. From SugarCRM:
‘Sprites is a smart way of using CSS to boost web performance by reducing the number of http requests that browser makes to the server. The way it works is that we combine several small images in one big image called sprite sheet. So now instead of making request for each small image, there will be just one request to the server for the big image that consists of all other small images. This way our page loads faster than usual.’
You should not need to install/configure anything for Sprites to work.