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Add article links about CLS and FOUT

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Helen Chong 2024-06-13 09:55:07 +08:00
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src/blog/posts/2024-06-12-performance-improvement-leilukins-hub.md
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@ -11,7 +11,7 @@ I use [PageSpeed Insights](https://pagespeed.web.dev/) to measure my website's L
## Optimising Custom Fonts
During the tests of Leilukin's Hub, PageSpeed Insights reported that the biggest factor in impacting the performance of this website is Cumulative Layout Shift (CLS). It took me a while to figure out using a custom font, namely the [Lexend font family](https://www.lexend.com/), was the cause of CLS of Leilukin's Hub — due to using a custom font as the default font, there was a flash of unstyled text (FOUT) for the entire page of Leilukin's Hub before the Lexend font loaded.
During the tests of Leilukin's Hub, PageSpeed Insights reported that the biggest factor in impacting the performance of this website is [Cumulative Layout Shift (CLS)](https://web.dev/articles/cls). It took me a while to figure out using a custom font, namely the [Lexend font family](https://www.lexend.com/), was the cause of CLS of Leilukin's Hub — due to using a custom font as the default font, there was a [flash of unstyled text (FOUT)](https://fonts.google.com/knowledge/glossary/fout) for the entire page of Leilukin's Hub before the Lexend font loaded.
This prompted me to research ways to optimise web fonts. Eventually, I solved the issue of FOUT and CLS by preloading the Lexend regular and bold typeface files (I used [google-webfonts-helper](https://gwfh.mranftl.com/fonts) to obtain the font files in WOFF2 format) in the `<head>` element, and turning my CSS stylesheet for Lexend into inline CSS by placing a `<style>` block for the CSS in the `<head>` element. Leilukin's Hub Lighthouse performance score improved as a result.