Use case demonstrated by attached demo application. Steps to reproduce:

1. Deploy application to Tomcat 5
2. Open application in IE6 or Firefox 2.0
3. There will appear an outputText saying 'Please wait...' and a commandButton
    Right when the application is started a custom Thread is executed in the background (which simulates a server-side action). After a certain period of time the
    Renderable bean's requestRender method is called (Thread's sleep time is set to 10 ms) in order to send an update to the client. This can be adjusted in
    TestWindowHandler.java
4. It now takes up to 20 sec until the update is sent to the client, even though the Thread's sleep time is set to 10 ms.
5. Change the sleep time to i.e. 3000
6. The initial update will be sent to the client at the correct time

Note that in firebug "block/receive-update-views" is waiting for about 10-20 sec and an update is first received by the following request.