We made some changes in legenda/css/et-fonts.css and added font-display: swap. I have sent you fixed file to your registration email. Upload it to your site. Fix will be included in the next theme update.
Thank you very much for the provided files, they helped and improved the situation. At the same time, 2 additional font files appear to need a further adjustment (font display swap):
Could you please have a look at it and do your magic?