Note that "load-styles.php" isn't any better https://wordpress.com/wp-admin/load-styles.php?c=0&dir=ltr&load%5B%5D=about,admin-menu,color-picker,common,customi

Note that "load-styles.php" isn't any better https://wordpress.com/wp-admin/load-styles.php?c=0&dir=ltr&load%5B%5D=about,admin-menu,color-picker,common,customize-controls,customize-nav-menus,customize-widgets,dashboard,deprecated-media,edit,farbtastic,forms,ie,install,l10n,list-tables,login,media,nav-menus,press-this-editor,press-this,revisions,site-icon,themes,widgets,wp-admin,&ver=4.7.5 https://wordpress.com/wp-admin/load-styles.php?c=0&dir=ltr&l... That being said, one can only hope that generating those isn't that heavy on the server.