Valor Process Preparation Start of Process preparation take more than 1 or 2 minutes

One reason could be the Server Name Resolution (get IP Address of Server Name)

Solution
Change configuration file to use IP address instead of Server Name.
File to Edit: C:\MentorGraphics\ValorMSS\2304\ProcessPreparation\Client\vPlan.exe.config
(Backup a copy before editing)

Find the key ServerAddress and change the Server Name to its IP Address
    <appSettings>
        <add key="ServerAddress" value="tcp://localhost:6000/MSSProcessPreparation/Server"/>
        <add key="EnableUndo" value="false"/>
        <add key="IPNbufferSize" value="150000"/>
    </appSettings>

In above example change localhost to IP address of Process Preparation Server
Be careful to keep ":" and Port number (:6000) which may be specific to your site.

Note: This works only if the Process Preparation Sever has a Static IP Address!
If you do not know the IP address then contact your local IT administrator.