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.