How can I tell that IISxpress will make my web site run faster?
To get an idea of how well your web site will compress use a program like GZIP or WINZIP to compress the files in your web site’s directories. This will give you a fairly accurate idea of what kind of gains you are likely to get. Alternately, once IISxpress is installed, you can use a tool like Fiddler or WebLoad to profile the responsiveness of your server and the size of the pages being downloaded by your users.