First CPU idle - MDN Web Docs Glossary: Definitions of Web-related terms 编辑

First CPU Idle measures when a page is minimally interactive, or when the window is quiet enough to handle user input. It is a non-standard Google web performance metric. Generally, it occurs when most, but not necessarily all visible UI elements are interactive, and the user interface responds, on average, to most user input within 50ms. It is also known as First interactive.