Lead Time
In the context of Predictive Preloads, lead time is the "head start" the browser gets to prepare the next page. It is the duration between when Speed Kit's Prediction Engine anticipates a user's next click and when the user actually clicks the link. A longer lead time allows the browser to fully pre-cache and even pre-render the next page, making the subsequent navigation feel instantaneous.
Related web performance terms
- Lab Data (Synthetic Monitoring)
Lab data is performance data collected in a controlled, repeatable environment using tools like Google Lighthouse or WebPageTest.
- Largest Contentful Paint (LCP)
A Core Web Vital that measures the perceived loading speed of a page. It marks the point in time when the largest content element (usually a hero image or a large block of text) becomes visible within the viewport.
- Largest Contentful Paint Subparts
The LCP Subparts are the distinct phases that make up the total Largest Contentful Paint time. Analyzing this breakdown is crucial for diagnosing the root cause of a slow LCP.
- Layout Thrashing
Layout Thrashing is a harmful performance anti-pattern.