We recently added a new monitoring option for setting a time-limit on how long a site can take to respond. This is a useful tool for getting alerts if your server is responding to requests but performing poorly. In order to conserve bandwidth, our normal monitoring only asks the server for the first 200 bytes of a page. In order to better represent the time it would take for an actual user to load a page from your site, there is a new option to include images and scripts when checking a website.
When you select this option, every time our monitor checks your site it will download not only the main html content, but also any scripts or images referenced in the page. The monitor will include the time it takes to download these additional resources when determining if a website responded within the time-limit you set.
It should be noted turning on this option will increase the amount of outbound bandwidth consumed by our monitoring service, which is why we leave it as an option. You can change this setting at any time.