Gowebbaby is a global web design company that has designed over 500 custom WordPress websites and 1000 blogs. There are several major issues that can cause a WordPress website to run slowly, including unwanted plugins, lack of caching, poor hosting, database optimization issues, and using an outdated version of WordPress. The document provides tips in each area to improve website speed, such as disabling unused plugins, installing a caching plugin, choosing a fast hosting provider, optimizing the database, and upgrading to the latest version.