iis7 enable compression for asp and aspx pages

HTTP Compression in IIS v7 (Windows 2008)

In IIS v6 HTTP compression is configured on a file type by file type using the file type extension whereas in IIS v7 it's configured using MIME types. IIS v7 also adds some additional capabilities such as allowing the generated HTML markup from ASP.NET to be compressed before being added to the page output cache & also to dynamically set when compression is switched on/off based on how stressed the CPU is.

Thankfully the MIME types we're interested in area already configured so there's nothing for us to add there like we had to in IIS v6.

• To set the compression level, open the C:\Windows\System32\inetsrv\config\applicationHost.config file and jump to the section (around line 574). Add the dynamicCompressionLevel attribute to the node like this:

   

• Next, tell IIS v7 to add compressed pages to the ASP.NET page output cache instead of deferring the caching until the request pulls it from cache:

  APPCMD.EXE set config –section:httpCompression /dynamicCompressionDisableCpuUsage:90

  APPCMD.EXE set config –section:httpCompression /dynamicCompressionEnableCpuUsage:1

• Finally, configure IIS v7 to dynamically turn caching on/off based on the utilization of the server... below I'm telling it to only compress when the CPU utilization is between 1-90%:

  APPCMD.EXE set config –section:urlCompression /dynamicCompressionBeforeCache:true

Take one last thing into consideration: your mileage may vary. What I mean by this is that *every* environment, site and usage is different. The settings I list here may or may not work for you. Like any performance optimization process, you need to adjust the tuning knobs, test and analyze the results to find what works best for your environment. I'm using a compression level of 9 simply to show how much it can help you. I've heard some say don't go above 4... personally I don't see why you shouldn't go as high as you can as long as the CPU can handle it. So again... your mileage may vary.

Happy caching!

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