I have reinstalled Ubuntu 18.04 and added gnome-session-flashback. When I play a video with the vlc player in my Metacity Flashback Session, it starts to jerk. But when I start a unity session, vlc plays my video perfectly.
I also have gnome-mplayer installed and it plays my video in a Flashback session without problems.
What could cause my VLC player to stutter during my Flashback session?