Web font loads without a font-display strategy
What this means
The page loads a web font whose declaration carries no `font-display` value. The browser then applies its default block period, during which the text is invisible — a flash of invisible text that delays when readable content appears and can push out Largest Contentful Paint on text-led pages.
How to fix it
Add `font-display: swap` (or `optional` for non-critical faces) to each `@font-face` rule, or append `&display=swap` to a Google Fonts stylesheet URL, so text renders immediately in the fallback face and swaps once the web font arrives.
Fix effort
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Authoritative source
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