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  1. stackoverflow.com

    I'm using @font-face to embed fonts in my website. First the text renders as the system default, and then (once the font file has loaded presumably) the correct font renders a fraction of a second later. Is there a way to minimise/get rid of this delay, by delaying the page rendering until after fonts have loaded or similar.
  2. Customize the text rendering delay. ... Understanding these periods means you can use font-display to decide how your font should render depending on whether or when it was downloaded. To work with the font-display property, add it to your @font-face rules: @ font-face {font-family: ...
  3. Resource load delay The time between TTFB and when the browser starts loading the LCP resource. If the LCP element doesn't require a resource load to render (for example, if the element is a text node rendered with a system font), this time is 0. Resource load duration The duration of time it takes to load the LCP resource itself.
  4. This document discusses performance best practices for fonts. There are a variety of ways in which web fonts impact performance: Delayed text rendering: If a web font has not loaded, browsers typically delay text rendering. In many situations, this delays First Contentful Paint (FCP).In some situations, this delays Largest Contentful Paint (LCP). ...
  5. simonhearne.com

    Inflating CSS size will almost certainly delay page render; Embedding fonts prevents you from effectively using subsets and unicode-range for different alphabets; In general, embedding fonts in CSS breaks the magic of web fonts: that browsers know what they need and will download it when they need it. There are two other options if you ...
  6. css-tricks.com

    Not only that, but it also needs to wait for the font file that is referenced as a URL value in the CSS @font-face definition to be requested and loaded. Bottom line: The font file becomes a part of the critical render path and it increases the page render delay. Critical render path delay when loading font stylesheet and font file
  7. pagespeedchecklist.com

    Fortunately there's a simple solution to configure Google Fonts to eliminate this render blocking resource. Loading Google Fonts. As with any custom fonts including self-hosted files, Google fonts are added to the page with a collection of CSS @font-face rules to define each specified font. These rules make the fonts ready and available for use ...
  8. debugbear.com

    Jan 8, 2025Use font-display: swap to show a fallback font until the custom woff2 file has been downloaded; ... The screenshot below shows a very large render delay component, as it takes a while to download the JavaScript code files and run the code once it's loaded.
  9. corewebvitals.io

    Dec 4, 2024If an LCP element uses custom web fonts, the browser might delay rendering it until the font is fully loaded. This is known as "Flash of Invisible Text" (FOIT) or "Flash of Unstyled Text" (FOUT). To avoid delays, consider font-display: swap to allow fallback fonts, or preloading key fonts to make them available sooner.
  10. Nov 1, 2023Images often determine LCP, but fonts can also significantly delay rendering. Diagnose your specific pain points based on user data. Optimize both over time. How can I prioritize LCP optimizations?
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  1. Edit: The best approach is probably to base64 encode your fonts. This means your font will have to be loaded fully by the time your HTML is parsed and displayed. You can do this with font squirrel's webfont generator https://www.fontsquirrel.com/tools/webfont-generator by clicking "Expert" and then "base64 encode". This is how services like TypeKit work.

    Original answer: Another way to detect if fonts are loaded would be using FontLoader https://github.com/smnh/FontLoader or by copying their strategy.

    They bind to the scroll event in the browser, because when the font loads it will resize the text. It uses two containing divs (that will scroll when the height changes) and a separate fallback for IE.

    An alternative is to check the DOM periodically with setInterval, but using javascript events is far faster and superior.

    Obviously, you might do something like set the opacity of body to 0 and then display it in once the font loads.

    --Ryan Taylor

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