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I've just been monitoring my cpu usage in openoffice calc when cells have been copied vs when they haven't and seen a dramatic increase in cpu usage for the Xorg process. The additional rendering required is a box with scrolling dashed lines around the cells that have been copied. The issue stands regardless of whether the window is minimised. Obviously it takes /some/ cpu power to render, but to increase an i7 by a more or less constant 7% usage seems slightly overkill. If anything surely this should impact on the gpu?

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I've found that turning off "Anti-Aliasing" speeds up OpenOffice on my system. The setting is in Tools->Options, OpenOffice.org->View. You might also want to experiment with turning on and off Hardware Acceleration.

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worked a treat - on my laptop (1.4 core2) it took cpu usage down from a constant 20% to 3% :D. Thankyou! –  James Jan 19 '11 at 23:40
    
Ditto here. Running Debian Squeeze on Atom 1.6, 2 GB RAM, Nvidia ION running nvidia proprietary driver. LibreOffice 3.4.3 from backports.org. As soon as I selected 2 cells and the running ants appeared, the Xorg CPU load peaked to 100% which rendered the machine unusable. Hardware acceleration is turned on. When I turned off anti-aliasing, everything went back to normal. –  user12538 Nov 19 '11 at 20:08

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