YSlow Yawn Meter

Shows the total time you've spent waiting for pages to load.

So far... 00h:00m:11s was spent waiting just for pages to appear! Add to this the time it takes for images, etc. to load and you begin to realize... how much of your life... is spent... just... waiting.

Load Time Summary

There were 7 pages for which a DOM event was received.
The total loading time for those pages was 00h:00m:11.816s, or 1.688s per page.

There were 5 pages for which both a DOM event and a page-complete event was received.
The total DOM loading time for those pages was 00h:00m:10.205s, or 2.041s per page.
The total page-complete loading time for those pages was 00h:00m:10.616s, or 2.123s per page.

Using the YSlow Yawn Meter

The YSlow Yawn Meter is more accurate if you follow the following suggestions.

• Enable the YSlow "Autorun" option via the YSlow icon in the task bar, or check the "Auto run test every time you launch YSlow" checkbox in the YSlow window (so load times are counted automatically)
• Use only one browser window (otherwise two separate instances of YSlow are running and load times in window 1 will not be counted in window 2)
• Use only one browser tab, if your browser supports tabbed browsing (opening a link in a new tab or window does not cause a page unload event so the load time for that pages is not counted)
• If you do use multiple tabs, use only one tab at a time (there is just one page unload event handler for all tabs, so (re)loading multiple pages at the same time may confuse the tool)

How the YSlow Yawn Meter Works

Three events are used to collect data about a page's load time. The first occurs when the user navigates away from the current page. This triggers an unload event, which is the start of the new page's load timer. The second event occurs when just the DOM portion of the new page has loaded (the DOM is equivalent to what you see when you view the HTML source of a page). The third event occurs when all external elements like CSS, JavaScript and images have finished loading and the new page is complete.

The load time that YSlow reports is simply the amount of time that passed between the unload event of the previous page and the page-complete time of the new page. To create a summation of all these load times, a tool must take into account that in regular web browsing, users don't always wait for pages to completely finish loading. A user could press the browser's stop button or navigate to another page before the page-complete event occurs. (It could also happen that a page is interrupted before even the DOM event occurs; since no DOM event is received, the tool does not add any wait time to account for those cases.)

The time shown at the top of this page was determined by summing up the elapsed time between the unload and DOM events for all pages loaded since the browser started up (measured not per tab but across all tabs). This is the minimum wait time as it does not include time for loading images, etc. For pages that were able to finish loading completely, there is some additional data to look at, which is shown in the Load Time Summary.