Can Managed Server self-tuning its performance without Admin Server?

I have an web application deployed on a managed server.
My observation is:
- If the Admin Server is not running, the application will keep accepting incoming external http requests and delayed the processing of them.
- If the Admin Server is running, the application will start the processing soon after the incoming requests arrive.
Can any body explain the reason behind it? Only default work manager is used in the above case.
Thanks

This seems a strange behaviour.
How is structured the application (app/webApp/ejbs/...)?
How is targetted ? The target is only on the managed instance?
Bye
Mariano

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