Performance & CDN

Caching, CDNs, TTFB, compression and speed optimization.

• What Is a CDN (Content Delivery Network)?
  A CDN keeps copies of your site's files on servers worldwide so pages load faster. Learn how a CDN works, what it caches and if you need one.
• What Is TTFB?
  TTFB measures how long a browser waits for the first byte of a response. See what affects it and how to lower it.