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Why Refine the Critical Rendering Path
Before the font appears on the web page, the browser mustdecide how to handle the rendering path to return the text to the user in the custom font.
The critical rendering path begins when the browser requests the HTML senegal phone numbers document and acquires the information it contains to build the page.
Optimizing the Critical Rendering Path - Mirko Ciesco
During this process it is important that the necessary fonts are available, otherwise the browser, while it will have already responded by drawing the layout and other content on the screen, will not insert any text pixels until the external fonts are loaded!
Furthermore, in this rendering path, different browsers behave differently from each other.
This is why web fonts can affect your site's performance and make web pages load slowly . Now let's look at some of the most common issues when choosing a font for your websites.
Problems loading a Web Font
Web fonts can cause site loading issues . Here are two typical situations that could increase your CLS (Cumulative Layout Shift: one of the Core Web Vitals metrics ) and worsen the user experience.
The most common loading problem encountered on websites is FOUT (Flash of Untitled Text) . During the time it takes to load the web font, the browser suggests an alternative font, which could also create problems with the layout of the page.
FOOT
FOIT (Flash of Invisible Text) occurs when the browser hides the webfont in its rendering path until it is completely downloaded. If this takes a long time, the page may remain without text for quite a long time and may increase the abandonment rate of the website.
Here's what could happen to your site:
Foit fout animation - Mirko Ciesco
Source: Malthe Milthers
The solution to these two critical issues is certainly the use of a “fake font” while waiting for the external font to be completely downloaded.
This solution is called FOFT (Flash of Faux Text) .
Further reading: Using dashboards for core web vitals
How to improve font loading
To speed up the loading of an external font and replace the character using the FOFT technique, you can use several strategies, developed in recent years.
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