We checked web fonts across 9.5 million sites. Those loading Google Fonts are good on LCP just 63% of the time on mobile versus 72% without, a 9-point loading penalty. Web fonts are a real loading cost, and here is how to keep it small.
Source: PageSpeed Matters analysis of 9.5 million origins with CrUX field data, May 2026.
Whether you count only Google Fonts or any web-font loader, the loading penalty is about 9 points.
Source: Google Fonts Costs 9 Points of Good LCP - PageSpeed Matters