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Compressing the files will decrease the size of the data that needs to be transferred, it does not solve the problem that the browser can only download a limited number of files at the same time. If you have many different files that need to be loaded the browser will not optimally use the bandwidth it has access to.
It will request some files from the server and wait until those files are retrieved before the rest of the files are requested. The solution to this problem is to combine all those different files into one large file.
And this is exactly what the script tries to do. You can concatenate different files by simply adding the names of the other files to the URL of the first file.
