AX 4.0 client slow in startup / logon

On a fresh AX 4 installation (yes, I know it’s still AX 4), we found out that the AX client is slow in startup and it takes about 10 seconds after double-clicking the Dynamics AX icon before the application is fully loaded.

It's really simple to resolve this. Go to IE > Internet Options > Advanced tab > Security node > verify that the "Check for publisher's certificate revocation" checkbox is unchecked.
Once this is done, AX client is loaded almost instantly after double-clicking the icon.

Installing Dynamics AX 2009 Client on Windows 7

When I try to install Dynamics AX 2009 Client on Windows 7, the installation failed with the following error:-

RegAsm : error RA0000 : Could not load file or assembly 'System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
...
Install: During Setup of an error occurred. Program run: C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe. Parameters: C:\Program Files\Microsoft Dynamics AX\Common\MindKeyGroup.MindKey.Wheel.dll /unregister

This looks strange to me because Windows 7 is certified for running AX 2009 Client. After looking into details of the error, it seems that .NET Framework v4.0 is used during the installation.
I uninstalled the Microsoft .NET Framework 4 Client Profile and install again the AX 2009 Client. The installation then was successfully.