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Thread: Help me find the bottleneck that slows down my pc

  1. #11
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    Default Re: Help me find the bottleneck that slows down my pc

    Quote Originally Posted by robertot5 View Post
    Hi,
    I keep struggling finding out what is causing my pc to slow down badly when for example I go on webpages with a lot of multimedia content (ex, youtube embedded videos, 9GAG) or when browsing zoomed webpages (example, playstation.com) or another example would be, I if go and copy a large file ( 10GB ) from my HDD to an external portable HDD (WD Passport).
    There's a wonderful firefox extension, called "flashblock".
    openSUSE Leap 15.1; KDE Plasma 5;
    testing Leap 15.2Alpha

  2. #12

    Default Re: Help me find the bottleneck that slows down my pc

    Did a reboot, and this is what free shows
    Code:
    Mem:       4053684    3108924     944760      16776     121864    1605768
    -/+ buffers/cache:    1381292    2672392
    Swap:      2103292          0    2103292
    OpenSUSE Leap 42.2 x64 KDE

  3. #13
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    Default Re: Help me find the bottleneck that slows down my pc

    On 2014-02-28 21:16, robertot5 wrote:
    >
    > Did a reboot, and this is what free shows
    >
    > Code:
    > --------------------
    >
    > Mem: 4053684 3108924 944760 16776 121864 1605768
    > -/+ buffers/cache: 1381292 2672392
    > Swap: 2103292 0 2103292
    > --------------------


    Well, you have to find out what of the things you do causes swap to be
    used. Not bad in itself, but if your usage pattern requires swap, well,
    you probably need more ram to speed things up, change how you do things,
    or accept it.

    However, if you hibernate the machine, swap is immediately used, and the
    above paragraph is incorrect.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

  4. #14

    Default Re: Help me find the bottleneck that slows down my pc

    Did some more investigations today,

    Here is the output of free just after I start my PC, cold start, with no applications opened, just desktop.


    Code:
                total       used       free     shared    buffers     cached
    Code:
    Mem:       4053684    1289840    2763844      15964      53056     559056
    -/+ buffers/cache:     677728    3375956
    Swap:      2103292          0    2103292



    Code:
                total       used       free     shared    buffers     cached
    Code:
    Mem:       4053684    2415696    1637988      54352      60156     959432
    -/+ buffers/cache:    1396108    2657576
    Swap:      2103292          0    2103292




    Here is the output of free after I started my usual applications (Thunderbird, Skype) and fired up a firefox page on the Playstation page wich instantly made the scrolling of the page to stutter, dragging a window with the mouse is not fluent, it stutters, everything goes slow.


    I see swap is not used, the RAM usage seems below 3gigs, so what causes this ? Could be something related to the GPU and\or drivers ?
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  5. #15
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    Default Re: Help me find the bottleneck that slows down my pc

    On 2014-03-01 13:56, robertot5 wrote:

    > Here is the output of free after I started my usual applications
    > (Thunderbird, Skype) and fired up a firefox page on the Playstation page
    > wich instantly made the scrolling of the page to stutter, dragging a
    > window with the mouse is not fluent, it stutters, everything goes slow.
    >
    >
    > I see swap is not used, the RAM usage seems below 3gigs, so what causes
    > this ? Could be something related to the GPU and\or drivers ?


    Yes, it is not swap usage.

    If it happens after starting a certain page, maybe that page runs some
    scripts that load the CPU. I have seen some such. Typically it is flash,
    but it can also be javascript. Or even some animations.

    You can keep an open terminal with "top" running on it, to watch if
    something is loading the CPU.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

  6. #16
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    Default Re: Help me find the bottleneck that slows down my pc

    An other idea:
    Have a look at the "top" command. Alternatively you can use the system-monitor (on KDE: Ctrl+Esc or "KSysGuard"). This outputs the processes that uses the most CPU.

    I for instance have to deactivate Apper's search for updates. On my slow dual-core machine working gets terribly awful when packagekitd sits on one one core.

  7. #17

    Default Re: Help me find the bottleneck that slows down my pc

    Well, I did kept terminal with top command set on CPU usage and when browsing multimedia filled websites the "plugin-container", "Xorg" and only sometimes "firefox" eats up 100% of CPU cycles. I got "Xorg" using 99% and "plugin-container" as well.

    When browsing zoomed websites with no flash, "/usr/lib64/firefox/firefox" is eating up to 79% CPU cycles.
    OpenSUSE Leap 42.2 x64 KDE

  8. #18

    Default Re: Help me find the bottleneck that slows down my pc

    I just did a test on an older PC, single core Sempron CPU, 2 gigs of DD2 RAM and windows xp, integrated GPU and guess what, I can browse those rich multimedia pages like lightning, no stuttering and no CPU usage above 20%, what the heck ?
    OpenSUSE Leap 42.2 x64 KDE

  9. #19
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    Default Re: Help me find the bottleneck that slows down my pc

    Hmm, yeah, this is a common problem (also for me). The flash-player on linux is really poor.

    Two things I can propose:

    1) Firefox extensions
    For me the following works nicely: Install the firefox extensions AdBlockPlus (ABP) and NoScript. These will let you decide which plugin and script to run.
    Since then, my firefox is idling at max. 10% with many, many tabs.

    Maybe you also try the NoFlash plugin that nrickert proposed.

    I think the default settings are rather perfect. Flash is allowed when I want it. Anything else is blocked. If a setting is wrong, you can easily change it in the context-menu.

    2) Fight against proprietary web-standards!

  10. #20
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    Default Re: Help me find the bottleneck that slows down my pc

    On 2014-03-01 16:26, robertot5 wrote:
    >
    > Well, I did kept terminal with top command set on CPU usage and when
    > browsing multimedia filled websites the "plugin-container", "Xorg" and
    > only sometimes "firefox" eats up 100% of CPU cycles. I got "Xorg" using
    > 99% and "plugin-container" as well.


    plugin-container is in fact the thing that loads flash.

    > When browsing zoomed websites with no flash,
    > "/usr/lib64/firefox/firefox" is eating up to 79% CPU cycles.


    Well, you have to block flash on all sites. I use "Flashblock 1.5.17".
    When a page contains flash, I get a box with an icon on the center. Only
    when I click that icon, flash is enabled and the animation is loaded.

    Thus only the flash animations I want do run.

    The plugin also blocks html5 animations by default.

    If you activate an animation that you do not wish to run, you can simply
    use kill to kill the plugin-container instance. Firefox keeps running,
    but the box that contained the flash dies.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

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