Hiring a LAB.js developer can significantly enhance your web application's performance. LAB.js is a dynamic script loader that increases the speed of your website by allowing parallel loading of JavaScript files. A developer with expertise in LAB.js can optimize your site's load time, resulting in an improved user experience and potentially higher search engine rankings. They can also ensure accurate execution order of scripts and maintain code modularity. Their skills can help you to achieve a more efficient, responsive, and user-friendly web application.