The think time is a delay inserted after the page or transaction is executed. Think time is not included in the page or transaction response time. The default think-time setting for pages is constant at 2 seconds, and the default for transactions is 10 seconds.
Higher think-times slow down the client request rate, which results in a lower server load. Increasing the think time will typically decrease the request rate and will allow the server to handle more virtual users.
Starting from v5.5, the think time property can contain decimals.