I don't think that the problem is driver or hardware. It seems the problem is X 
server/GTK implementation.
After the simple change in /etc/X11/xorg.conf I have found here in comments the 
Eclipse had 17 hours uptime with heavy refactoring and then I only turned off 
the computer. Eclipse never before lasted so long and GUI was not so fast.

Option  "AccelMethod"   "xaa"

I can't say that the cause is exactly same, but surely helped the same thing.
I don't know who and why thinks that the problem is only with Intel ...?

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https://bugs.launchpad.net/bugs/238629

Title:
  [i965] Java plugin causes massive Xorg CPU usage, fixed with XAA
  (UXA/EXA)

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