There is some (minimal) information in the SDK regarding Performance Best Practises for integrating with CRM Services:
http://msdn.microsoft.com/en-us/library/gg509027.aspx#Performance
Nothing specifc regarding multi-threading other than to use it. Although the section on caching is probably pertinent to you.
Caching
To improve performance on requests to the Web services, you can statically cache the IServiceConfiguration class. In addition, monitor your WCF security token and refresh it before it expires. By refreshing the token before it
expires, you will not lose the token and have to start over with authentication. To check the token, you can create a class that inherits from the OrganizationServiceProxyclass
or the DiscoveryServiceProxy class, or wrap those classes in a new class. You can see an example
of the first method in the ToolServiceProxies.cs and AutoRefreshSecurityToken.cs sample code files in the Tools\PluginRegistration folder of the SDK download. Another alternative method is to manually check the token before each call
to the Web service.
You should note that if you enable early bound types, you enable this for all proxies that use that IServiceConfiguration instance.
If your application makes use of the metadata, it is recommended that you cache the metadata you have retrieved and to periodically call the RetrieveTimestampRequest message
to determine if you need to refresh the cache.
--pogo (pat)
