Turn off photo screensaver
From LinuxMCE wiki
If your video looks jerky, or your system seems to respond slowly, you can try to turn off your Photo Screensaver.
- Go to the KDE desktop, from the Linux MCE Launch Manger panel, choose "open admin website". Login using the username you defined to LinuxMCE during setup. By default the password is your username.
- Choose Media Directors. Then scroll down to Software Modules. Click on edit. You can then deselect the photo screensaver.
- Go back to the Linux MCE Launch Manger pane. Stop LMCE Media Director (MD). Then start it again.