After reading the changelog for Matomo 3.4 I saw you use woff fonts. Would be nice if you could add woff2 fonts as well:
The new WOFF 2.0 Web Font compression format offers a 30% average gain over WOFF 1.0 (up to 50%+ in some cases). WOFF 2.0 is available since Chrome 36 and Opera 23.
I just wanted to add the woff2 file as it should be a quick fix, but I noticed that icomoon, which we are using for the font generation only supports woff2 for premium members.
This converter tool is very useful for converting from woff to woff2.