Lagy of vibrating scrolling and desktop switching

My iMac 27" is not scrolling smoothly.
When I scroll in all apps (like Safari) of when I swipe between 2 dekstops the contents being moved is vibrating/shaking during the animation in stead of smooth scrolling.
As a fix i've tried to clean OSX with OnyX cleaning software and installed the NVIDIA CUDA driver. Both actions did not improve anything.
Specs:
iMac 27" end 2012 i7 32 GB Geforce GTX 680MX 2GB 768GB FlashDrive Mac OSX Mountain Lion 10.8.4
Anybody any advise?

Try a restart.
Do a backup, using either Time Machine or a cloning program, to ensure files/data can be recovered. Two backups are better than one.
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work. The intent is to see if it is specific to one account or a system wide problem. This account can be deleted later.
Isolating an issue by using another user account
If the problem is still there, try booting into the Safe Mode. Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application uninstaller. For each disable/delete, you will need to restart if you don't do them all at once.
Safe Mode
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