ASP.NET 4 introduces the ability to turn on compression of session data.
Compression is disabled by default, to enable it modify the web.config file and set the new compressionEnabled attribute to true:
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0"/>
<sessionState
mode="InProc"
stateConnectionString="tcpip=127.0.0.1:42424"
stateNetworkTimeout="10"
sqlConnectionString="data source=127.0.0.1;Integrated Security=SSPI"
sqlCommandTimeout="30"
customProvider=""
compressionEnabled="true"
cookieless="UseCookies"
cookieName="ASP.NET_SessionId"
timeout="20"
allowCustomSqlDatabase="false"
regenerateExpiredSessionId="true"
partitionResolverType=""
useHostingIdentity="true">
<providers>
<clear />
</providers>
</sessionState>
</system.web>
</configuration>
The <sessionState> element is not defined in either the root machine or web config, and according to msdn the above (minus the compressionEnabled attribute) is the default.
The choice to enable compression should only be taken if the server is not already CPU bound as compression adds an additional compression/decompression overhead.
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