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Every time my machine is stumbling, I run a top command and the compiz process is eating a lot of CPU. How can I configure it to consume the minimum of machine resources? I don't care for fancy graphics or effects. I have an integrated intel graphic card.

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See What are the system requirements for each flavor of Ubuntu Desktop? for less hungry environments. –  user25656 Oct 5 '13 at 16:24
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Your machine may be underpowered, but Compiz is also buggy and sometimes crashes or gets into an unstable state. At this point you can run "compiz --replace" (from the dash, or using the Alt-F2 shortcut). That will 'reboot' Compiz without having to close any programs or log out. –  Eric Lambart Oct 10 '13 at 20:26

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My computer had an integrated Intel board. I've installed a new NVida 630 card and everything is great now. If I knew that it would improve so much, I'd had installed it before.

Long are the days where we could install Linux in old machines. If you have a weak graphic card, use Lubuntu, Xubuntu or Mint. After years re-compiling Gentoo, I just wanted the most used linux on the market. Bad choice for my machine.

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Install CCSM and de-select any nonessential effects plugins

To install Compizconfig settings manager open a terminal (ctrl + alt + T) and run this command (you can paste it into the terminal with ctrl + shift + v):

sudo apt-get install compizconfig-settings-manager python-compizconfig compiz-fusion-plugins-extra compiz-fusion-bcop compiz-fusion-plugins-main compizconfig-backend-gconf

Information regarding the usage of CCSM can be found here

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This message looks reasonable, why it were downvoted? Which effects may I considere "nonessential"? –  neves Oct 10 '13 at 20:39
    
you can test by deselecting one plugin at a time and see if it works for you. there're many plugins out there. it is considered nonessential in the sense that it doesn't break things or your working habits. –  sgx1 Oct 14 '13 at 6:36

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