It took a while to figure this out. Setting the hourHitThreshold attribute to 1 on the system.webServer / serverRuntime node in the applicationHost.config file should do the trick, as described in http://www.iis.net/ConfigReference/system.webServer/serverRuntime .
You can do this by running the following command as an administrator:
%windir%\system32\inetsrv\appcmd set config /section:serverRuntime /frequentHitThreshold:1 /commit:apphost
A word of warning - the concept of "frequent hit" is not like compression. I do not know if there are other consequences as a result of this!
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