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I just upgraded my Ubuntu 14.04 32 bit to 64 bit. I find right after I boot it the first time that the machine is running really slow, even slower than when I had the 32 bit version.

I find that when I run top command, the compiz process is occupying 90% of the CPU. I tried to resolve that somehow, but no success yet. I also saw a message from the system saying that 3D at this time is being done in software and X is not using hardware acceleration to achieve it.

I want to ask if someone else also faced this issue, and how could I bring my machine up to speed.

I have i7 processor with 16 GB of RAM.

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  • Could you add output of sudo lshw -c display to the question.
    – user.dz
    Jul 12, 2014 at 7:35
  • I am facing same issue, I upgraded Ubuntu 14.04 32 bit to 64 bit. I using 4GB of Ram and I5 processor, when I type free -m command shows free 288mb and used 3465mb and $> sudo lshw -c display description: VGA compatible controller product: Core Processor Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0
    – prabu
    Aug 26, 2014 at 5:30

2 Answers 2

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see the post for ubuntu 12.04 and solving memory issues with compiz

Compiz using 8% - 25% cpu continually

most of the fixes are backup/delete setting file or changing compiz settings

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For 64 bit O.S you must have more than 4GB RAM, in other case will be very Slow !!! I had the same problem, finally reinstalled 32 bits and my laptop is fast again.

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    read carefully..the OP said he has 16GB
    – AlexGreg
    Sep 11, 2015 at 10:22

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