Cache Duration

The cache duration tells Chartio how long to keep chart data before querying your database for fresh data. If you would like fresh data very often, you can set the cache duration to a lower time interval. On the other hand, if you are worried about database performance and want to limit how often new queries are sent to your database, you can set the cache duration to a higher value.

For details about caching, see here, How does caching work?