UberMenu loads two CSS stylesheets by default: the core ubermenu.min.css file and a skin file of your choosing.
UberMenu loads Font Awesome by default, which provides icons that can be assigned to menu items. If you don’t intend to assign icons to your items, then you can disable Font Awesome and use the Essential Icon SVGs instead.
Please note that not all plugins’ assets can be properly optimized. If you have another plugin that causes problems, it can break UberMenu when all the CSS and JS is combined. In this case, you’ll just need to disable the optimization plugin, or configure it to avoid errors.
Note that you should not enable caching or optimization plugins during development, as they can prevent you from seeing changes to your site