Window dragging issues on second display

Hello everyone,
I have secondary display with 1920x1200 resolution and rotated 90° (portrait mode) connected to MB Pro early 2011. After updating to Mountain Lion from AppStore I faced with quite annoying effect on this display: when I drag any window over the desktop it's moving quite jerky. Also all system menus (dis)appearing with pulsing effect. When I drag any window to desktop on MacBook display - everything is smooth and OK.
Also I noticed that during desktop video capturing (using quicktime) overall perfomance degrades significantly: mouse cursor moves lazily, windows movements are really slow.
I'm feeling that this is serious software problem.
Is this known issue? Could someone reproduce it? Any workaround?
HW: MB Pro early 2011,
OS: Mac OS X Mountain Lion,
Secondary display: Dell U2412M, 1920x1200, connected through DisplayPort input.

Try repairing your permissions. Go to applications then to the "other" folder then go to disk utility, on the left hand side you will see a white box. Select the second option, usually called "mac HD" with that selected click on "repair permissions" in the center towards the bottom of the screen. Wait for it to complete, then see if this fixes the issue.
SMC:
http://support.apple.com/kb/HT3964
PRAM:
i. Ensure the machine is powered off.
ii. Locate the following keys on your keyboard in preparation for Step 4:
‘command’ – ‘option’ – ‘P’ – ‘R’
iii. Press the ‘power on’ button.
iv. Immediately – and before the grey screen appears – hold down ‘command-option-P-R’ all together.
v. Keep them held down until you’ve heard the start-up chime twice. After you release them you should hear it again, and hopefully your Mac will boot up normally.

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