Remove Dashicons for Performance

Hi,
I would like to remove Dashicons for performance. Originally I was using this custom styling but I think it stopped working in the latest versions:

#{$wrap} {
clear: both;
}
#{$wrap} #{$menu} li.mega-menu-item-has-children > a.mega-menu-link > span.mega-indicator:after {
font-family: inherit;
content: “▾”;
}

#{$wrap} #{$menu} li.mega-menu-item-has-children.mega-toggle-on>a.mega-menu-link>span.mega-indicator:after {
content: ‘▴’;
}`

The page I need help with: [log in to see the link]