I ran into this issue as well when working on https://starthq.com

The font file is loaded the first time any text using the font is displayed and I am using Font Awesome for the icons which are only visible when selecting a drop down menu. As a result there was a very annoying flicker the first time the menu was displayed.

The somewhat hackish solution was to include one of the icons that uses the font as part of the logo in the upper left of the page, which is rendered on initial page load.