The installation process of the extension is just as usal. You need to download and install the extension by the extension manager. Maybe you will be surprised that the extension doesn't offers any configuration possibilities afterwards like the preceding versions, but this was a simply result of the whole refactoring in version 3. You will find a complete new configuration inside the provided static typoscript template.

If you have done the described steps above, you will need to add the static template on the page or pages you want to include into the optimisation process.  Due this you can simply test the extension on a small page or page segment before you include it on the whole site, because the extension will simply do nothing without an included static template.

Please don't test the output of your pages now, because it will simply not work. You need to apply one additional step before you can start the testing. The extension needs some additional .htaccess entries to work like expected. The code must be added somewhere inside the .htaccess file which you can find on your site root. If you haven't realurl or something equal already installed, you will need to rename the file from _.htaccess to .htaccess. You can find the code in the included example.htaccess file of this extension. After this step you are finally encouraged to test the results.

Maybe you will be surprised of the nice results after this step on the frontend pages, but often you will experience problems with some scripts too. Sometimes the minifcation process will not work like expected and produces errors or some scripts are in a wrong order due the merging. But please don't give up now! You can configure the extension in a lot's of nice ways to exactly prevent such problems. If you want to read more about it, then just continue with the next chapter.