The fonts specified in fonts.css aren't preloaded, this means that they can only be loaded once the CSS itself has been downloaded and parsed, which leads to rendering delays.
Once ✨ Support prefetch/preload/dns-prefetch in the libraries API Active is done this should be possible via the libraries definition.
Until then it probably needs a hook_page_attachments_alter() to add the link preload to html head, or Olivero does it with a twig template that is included in page.html.twig
Active
1.0
CSS
It affects performance. It is often combined with the Needs profiling tag.
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