What is prefetching?

Prefetching is a technology approach that is used to shorten website loading times and thereby improve the user experience (UX). Certain resources, such as images, scripts and style sheets, are loaded in advance by the browser before the user actually needs them. This reduces the actual waiting time for content to load when the user navigates to another page or clicks a link.

How prefetching works

During prefetching, the browser analyzes the source code of a website and recognizes the links to various resources such as external JavaScript files, CSS files and images. These resources are then downloaded and stored in a local cache. Now when the user performs an action that requires retrieving one of these resources, it can be quickly loaded from the cache instead of making an additional request to the web server.

Advantages of prefetching

• Improved loading times: By preloading important resources, the loading time of websites is reduced.
• Better user experience: Fast loading times lead to an improved user experience and higher website visitor satisfaction.
• SEO Benefits: Since search engines consider loading times as a ranking factor, the use of prefetching can help improve a website’s position in search results.

Potential disadvantages of prefetching

Although prefetching can improve the user experience, there are also some potential drawbacks that should be considered:

• More Bandwidth: Preloading resources can increase bandwidth consumption, which can be particularly problematic for users with limited data volumes.
• Unused Resources: There is a possibility that some of the preloaded resources may not be needed if the user ultimately takes another action or abandons the website.
• Caching Issues: When resources are cached, there may be issues updating those resources. In some cases, this may result in outdated or incorrect content being displayed.