This donut caching seems pretty cool so I've been looking into it a bit.

I did wonder how much use it would be with Umbraco where the content XML is already cached but it does make a difference. I suppose you just have to consider if you can afford the extra memory.

I wanted to share something I found, Using a cache profile.

Rather than decortaing all your controller actions with the same caching options you can simply add the following within the system.web section of the web.config:

<caching>
      <outputCacheSettings>
        <outputCacheProfiles>
          <add name="OneDay" duration="86400" location="Server" varyByCustom="url;device" />
        </outputCacheProfiles>
      </outputCacheSettings>
</caching>

The declaration on the controller action then becomes:

[DonutOutputCache(CacheProfile="OneDay")]

The advantage is you don't have to search all your code to make a change and a any modifications are quickly made in the web.config so no recompilation and assebly deployment.

Matt