2204622 - Portal logon slow due to Multiple domain configuraiton

When you try to logon to portal, after input user and password, it's very slow and takes long time which impact user a lot.
If you take HTTP trace (check note 1558903 - How To Trace a Portal Scenario Using HttpWatch ), there will be followings:

From above screenshot, we can see the following URL in the post request takes more than 500 seconds.

http://host:port/irj/servlet/prt/portal/prtroot/com.sap.portal.usermanagement.admin.mdc

The application "com.sap.portal.usermanagement.admin.mdc" is using for SSO for multiple domain.

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• EP Release Independent
• SAP NetWeaver
• SAP Composition Environment

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP NetWeaver Composition Environment 7.1 ; SAP NetWeaver Composition Environment 7.2 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 1 for SAP NetWeaver Composition Environment 7.1 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

Multiple domain, SSO, com.sap.portal.usermanagement.admin.mdc, ume.login.mdc.hosts, logon slow, blank, page, loading, stuck, freeze, froze, frozen, empty, white, screen, Enterprise Portal 7.0, EP 7.0, Enterprise Portal 7.01, EP 7.01, Enterprise Portal 7.02, EP 7.02, Enterprise Portal 7.30, EP 7.30, Enterprise Portal 7.31, EP 7.31, Enterprise Portal 7.40, EP 7.4, Enterprise Portal 7.50, EP 7.5 , KBA , BC-JAS-SEC , Security, User Management , EP-PIN-NAV , Navigation , BC-JAS-SEC-LGN , Logon, SSO , Problem