dns-prefetch
dns-prefetch is a resource hint (``) that instructs the browser to perform only the DNS lookup for a specific domain in the background. This is a lightweight way to resolve a domain name to an IP address ahead of time, which can save a small amount of latency on the initial connection when a resource from that domain is eventually requested.
Related web performance terms
- DOM (Document Object Model)
The DOM is a tree-like representation of all the elements in an HTML document that is created by the browser when it loads a page.
- DOM Content Loaded
DOM Content Loaded (DOMContentLoaded or DCL) is a browser event that fires when the initial HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading.
- DOM Size
DOM Size refers to the total number of elements (nodes) and the complexity of their nesting within a page's HTML structure.
- Deferred JS loading
Deferred JS loading is a technique for loading JavaScript files in a non-blocking way using the `defer` attribute on a `<script>` tag.