A metric that measures how quickly a web server responds to a request and begins sending back data. In other words, it measures how long it takes for a web server to start delivering content to a user’s browser after the user requests a web page.
TTFB can be affected by several factors, including:
- Network latency: the time it takes for data to travel between a user’s browser and the server. Network latency can be affected by factors such as the physical distance between the user and the server, the quality of the internet connection, and the type of device being used.
- Server processing time: the time it takes for the server to process a user’s request and generate the HTML response. Factors that can affect server processing time include the complexity of the website code, the number of simultaneous requests, and the server’s available resources.
- Content delivery network (CDN): A CDN can reduce TTFB by delivering content from a server closer to the user’s location, reducing network latency and speeding up delivery.
- Caching: Caching can reduce TTFB by storing frequently accessed content in a cache, so it can be delivered quickly without being generated from scratch on each request.
Overall, TTFB is an important metric for measuring website performance, particularly for mobile users with slower internet connections. To optimize TTFB, website owners can focus on reducing server processing time, optimizing network performance, using a CDN, and implementing caching strategies.
