CORS (Cross-Origin Resource Sharing)
CORS is a browser security feature that uses HTTP headers to manage whether a web page from one domain is allowed to fetch resources from another domain. It is a fundamental mechanism that enables the secure loading of assets like fonts, API data, and scripts from third-party services.
Related web performance terms
- CDN (Content Delivery Network)
A CDN, or Content Delivery Network, is a globally distributed network of servers designed to deliver web content to users quickly and efficiently.
- CPU time
CPU time is the amount of time the Central Processing Unit (CPU) of a user's device spends processing the scripts and rendering a webpage.
- Cache
A cache is a high-speed, temporary storage layer designed to store copies of website files (like HTML, images, and scripts) closer to the user.
- Cache Contamination
Cache contamination is a critical issue where a caching system incorrectly stores and serves personalized or user-specific content to the wrong users.