Preload

Table of Contents

• When to Use
• When NOT to Use
• Instructions
• Details
• Source

Preload (<link rel="preload">) is a browser optimization that allows critical resources (that may be discovered late) to be requested earlier. If you are comfortable thinking about how to manually order the loading of your key resources, it can have a positive impact on loading performance and metrics in the Core Web Vitals. That said, preload is not a panacea and requires an awareness of some trade-offs.

When to Use

• Use this when critical resources (fonts, scripts, images) are discovered late in the loading process
• This is helpful for improving Time To Interactive (TTI) and Largest Contentful Paint (LCP)

When NOT to Use