Service Worker Lifecycle
The Service Worker Lifecycle refers to the sequence of states a Service Worker goes through from its initial registration to becoming active. The main phases are installing (the browser downloads and parses the script), installed (the worker is ready to take control), activating (the worker takes control from any old versions), and activated (the worker is now running and can handle events like intercepting network requests). Understanding this lifecycle is key for debugging service worker behavior.
Related web performance terms
- Search Engine Optimization (SEO)
SEO is the process of improving a website's visibility in search engine results pages (like Google). The goal is to rank higher than competitors for relevant search queries to attract more organic (free) traffic.
- Server Response Time
Server Response Time is a component of Time to First Byte that measures how long the server takes to process a request and start sending back a response, excluding network latency.
- Server Timing
Server Timing is a browser API that allows the backend to communicate performance metrics about its own internal processes (e.g., database query time, time to render a component) to the browser via HTTP headers.
- Server-Side A/B Testing
This is a performance-friendly method for running A/B tests. Unlike Client-Side A/B Testing, the decision of which variation to show a user is made on the Origin Server.