[nerbert]

The whole sprite image for the file icons is 16 x 606 so size is not an issue here. What is nice is that when you view a directory with an unusual file type in it, like swf or mp3, the icon is right there and is loaded just as fast as the commonly used ones such as php or js.

Also sometimes the directory tree would load unevenly and directory names would shift as the images would load.

Probably the main advantage of sprites in this project is it cuts down the length of the html string for the directory tree. Instead of an image tag it just uses a three letter class name

I also minified all the JavaScript files. I don't know how much difference that makes.