In the current .htaccess file we have special directives to cache all assets (javascript. stylesheets, images, icons) for 1 month. I think we also need to include font files in that list by adding following to the <IfModule mod_expires.c> block:
ExpiresByType application/vnd.ms-fontobject "access plus 1 month" ExpiresByType application/x-font-opentype "access plus 1 month" ExpiresByType image/svg+xml "access plus 1 month" ExpiresByType application/x-font-ttf "access plus 1 month" ExpiresByType application/font-woff "access plus 1 month"