PageSpeed insights fontello.woff preload

Hello,

In Google PageSpeed insights there is following opportunity suggested.

URL
Potential Savings
…fonts/fontello.woff(techtestreport.com) 3,060 ms

Preload key requests 3.06 s
Consider using <link rel=preload> to prioritize fetching resources that are currently requested later in page load. Learn more.

I already changed the Icon in the customizer to SVG and emptied my cache. It is still not going away.