After the last release, I noticed in some tests of the new installer that the game seemed to hang for about 5 seconds at the start of every video, and when aborting a mission.
Thanks to talbin on the CNCNZ forums, the cause of this issue has been pinpointed. In the game folder, inside "ddraw.ini", there is an option that says "singlecpu=true". This should be changed to "singlecpu=false". I have no idea how that snuck in there, especially since it is not among the options editable through the configuration tool.
The installers of both the patch and the full game pack have been updated to fix this issue.