My CPU is AMD A6-9220 RADEON R4. I use Ubuntu 16.04.1. No additional (proprietary) drivers available. CPU loads both in Chrome and Firefox, hardware acceleration is off in Chrome. It happens when I scroll page mostly. Or when browser open and I do something else (run some other tasks).

Using top command I've found out that Xorg process eats about 50%.

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  • Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. What version of Ubuntu are you using?
    – Ramhound
    Aug 29, 2018 at 15:12
  • @Ramhound I added version of Ubuntu and exact model of CPU, something else ?
    – Jack J
    Aug 29, 2018 at 15:22
  • 2
    It's the lack of optimization of the driver to the application code. In this case a very basic CPU commands are used when accessing CPU resources shared with other apps/OS (accessing cache, TLB, other buffers used when running application code).
    – Hardoman
    Aug 29, 2018 at 16:58

1 Answer 1

  1. Run the following command during high load and find out which process is causing it:

  2. Then you can use ps or ptree commands for the process to drill down further.

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