Long Cache TTL

Caching can speed up your page load time on repeat visits. When a browser requests a resource, the server providing the resource can tell the browser how long it should temporarily store or cache the resource. For any subsequent request for that resource, the browser uses its local copy rather than getting it from the network. The max-age directive tells the browser how long it should cache the resource in seconds. You should cache immutable static assets for a long time, such as a year or longer. A longer cache duration isn't always better. There are many directives for customizing how the browser caches different resources.