Setting the JSP Reload Time
Most servlet containers have the ability to set an interval for when to check for updated JSPs. This feature is very useful during development, allowing you to quickly redeploy your JSPs. Thus, you do not have to bounce the server every time you want to test a change.
As you can imagine, this feature comes with a performance hit. It is wise to check for a new JSP every few seconds or minutes in a development environment. However, you should most definitely turn this off in a production setting.