The problem with screen freezing seems to be solved when I set 
/proc/sys/vm/swappiness to 0 (probably 10 also will be fine).
And I should note than in my case of screen freezing mouse cursor also stops 
moving completely. Such freeing lasts from 1 second to ~10 seconds.

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https://bugs.launchpad.net/bugs/1184451

Title:
  Ubuntu 13.10 random screen freeze while Normal OS activites

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