Javascript/JS is not loading correctly

This can be caused by a range of issues, so it'€™s essential to perform all verification and troubleshooting steps below.

You should also test for existing Javascript errors on your site before installing Fooman Speedster (if you have already installed the extension, disable fooman Speedster to do this). Fooman Speedster relies on all Javascript on your store being completely error free. If your store contains existing Javascript errors, these will be magnified when installing Speedster and could cause issues with your store's frontend. The Speedster self-test does not include testing for existing Javascript errors on your site so it'€™s important to do this separately.

Also check that your setup meets all system requirements for Fooman Speedster.