This requests Google Fonts to deliver fonts with the `font-display: swap;` CSS option, reducing time until meaningful display epecially on slow connections. Including this option is suggested by default now from Google Fonts.
<!-- Stylesheets -->
{if $__wcf->getStyleHandler()->getStyle()->getVariable('useGoogleFont')}
- <link href='//fonts.googleapis.com/css?family={$__wcf->getStyleHandler()->getStyle()->getVariable('wcfFontFamilyGoogle')|urlencode}:400,300,600' rel='stylesheet' type='text/css'>
+ <link href='//fonts.googleapis.com/css?family={$__wcf->getStyleHandler()->getStyle()->getVariable('wcfFontFamilyGoogle')|urlencode}:400,300,600&display=swap' rel='stylesheet' type='text/css'>
{/if}
{@$__wcf->getStyleHandler()->getStylesheet()}
{event name='stylesheets'}