Warnings and errors will be send to the windows event log.

Diagnostic information

IIS WebSpeed exposes a few urls that allow viewing diagnostic information. By default, these urls are only accessible from the local machine. If you want them to be publically accessible, or authorize them yourself using the request filtering module, you can add this to iispeed.config:

IISpeed InfoUrlsLocalOnly off

PageSpeed Logging

Viewing the last few IIS WebSpeed log messages


These messages are collected globally from all worker processes.

PageSpeed Global Statistics

Global statistics and configuration can be viewed at


PageSpeed WebSite Statistics

Per website statistics and configuration can be viewed at



The PageSpeed console also offers opportunities for monitoring your IIS WebSpeed installation.



IIS WebSpeed debug output can be viewed using DebugView (downloadable at microsoft technet).

To get as much debug information as possible, you can also put a line containing IISpeed diagnose into the root configuration file.

If you're capturing diagnostics of IIS WebSpeed via DebugView, make sure to enable Capture Global Win32.