5 Ways to Optimize Font Loading Performance.pdf

The presentation titled "5 Ways to Optimize Font Loading Performance" by SEO expert Jeansy Sese delves into advanced techniques for improving website speed through font optimization. In this series of slides, Sese breaks down the five most effective strategies to reduce font load times, from leveraging modern font formats like WOFF2, to fine-tuning CSS delivery and preloading essential fonts. The presentation highlights practical steps to enhance both user experience and search engine ranking by reducing render-blocking resources and improving page load speed—crucial factors in SEO performance. Each method is supported with detailed explanations and actionable insights

1. 5 Ways to Optimize
Font Loading Performance
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2. What is Font Loading Performance?
Font loading performance encompasses the efficiency with which web fonts are
fetched, processed, and rendered by a browser, impacting both user experience and
page load times. This performance is influenced by several factors, including the timing
of font retrieval, network conditions, and rendering strategies.

Key considerations include the use of the font-display property to manage how fonts are
displayed during loading, and leveraging browser caching and compression techniques
to reduce file sizes and improve loading speed.

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3. Here 5 ways you can optimize
and reduce font loading time :



1.Decrease the size of font files
2.Decrease the Count of Font Files
3.Use Font Loading API
4.Cache the FONT Files with Service Workers
5.Use Font-display

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4. 1. Decrease the Size of Font Files
To reduce font file sizes, consider minimizing the number of font files, changing their file
extensions, and removing unused glyphs.

Each font file adds to the total size of a web page, and having multiple font files results
in multiple requests, which can significantly increase the overall page load time.
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5. 2. Decrease the Count of Font Files
Minimizing the number of font files involves cleaning up and deleting unnecessary font
files from a website’s resources. By reducing the total count of font files, the website’s
main content can load faster, improving overall performance.

Fewer font files enhance text rendering efficiency and reduce the impact on the
browser’s main thread, which can otherwise delay rendering and resource loading. For
instance, using 11 different font files can block the main thread, hindering the request
and rendering of other resources, thereby delaying the first contentful paint.

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6. 4. Cache the FONT Files with Service Workers
Service Workers are browser-based caching systems that allow a browser to load web
page resources locally, bypassing server requests. By caching font files with Service
Workers, a browser can access these files from local storage rather than fetching them
from the server, leading to a reduction in font load times.
This approach can improve font loading speeds by 20% to 40%, depending on the
server’s Time to First Byte.
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7. 5. Use Font-display
The font-display CSS property influences the timing of web font file loading and how
font files are handled during this process. It works in conjunction with the @font-face
rule and can be set to one of five values: auto, block, swap, fallback, and optional.

The font-display property dictates how and when a font file should be loaded and when
it should replace the default font provided by the browser. Adjusting these values can
significantly impact font loading performance. Below are the meanings of the different
font-display property values to help optimize font loading speed.

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