To optimize fonts for your WordPress site, use a limited number of fonts and only include the font styles that are necessary. Consider using variable fonts and the font-display: swap property to improve font loading performance. If possible, use local fonts to avoid making external requests. These optimizations can help reduce the loading time of your site and provide a better user experience for your visitors.

To improve font loading performance, consider preloading only the fonts that are used in above-the-fold content. Preloading unnecessary fonts can increase the Largest Contentful Paint (LCP) metric, which can negatively impact page load times. Using critical fonts is also a recommended practice.

Critical fonts is a unique feature offered by Swift Performance that optimizes font loading by creating critical font files for above-the-fold content. This can dramatically decrease font loading times, improve the Largest Contentful Paint (LCP) and First Contentful Paint (FCP) metrics, and boost overall page load times. By using critical fonts, site owners can provide a better user experience and improve site performance.

PageSpeed Insights chooses the server location for the test based on the current location of the user. There are four server locations: Oregon, South Carolina, Netherlands, and Taiwan.

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Short answer: no

Waterfall charts may display a ?wc-ajax=get_refreshed_fragments request, but it typically won’t have a significant impact on Core Web Vitals, as it usually runs late in the page load process. While this request may affect metrics like FID and CLS, it’s usually not significant and may not impact these metrics at all.

Cumulative Layout Shift (CLS) has become a critical performance metric, as it measures the amount of visual instability that users experience during page load.

While using a well-coded theme and good plugins can help reduce CLS, delaying all JavaScripts or using poorly-coded themes/plugins or third-party embeds can cause significant CLS issues.

To address CLS, it’s recommended to use an automated CLS optimizer, which can analyze the layout of the page and determine which elements are contributing to CLS, and optimize them accordingly. Optimizing CLS manually can be a complex and time-consuming task, but with the help of a CLS optimizer, website owners can quickly improve the user experience of their site.

Lab Data for web vitals is collected in a controlled environment using emulated network and device conditions, while Field Data is collected from real users in real-world conditions. Lab Data is useful for debugging and optimization, while field data provides insights into the user experience.

Field data is a ranking factor for SEO, while lab data does not directly impact rankings, nor user experience