On Tue, 26 Jun 2012 17:28:26 +0200, Merciadri Luca wrote:

> Camaleón <noela...@gmail.com> writes:
> 
>> Top command output would be interesting :-)

> Tasks: 203 total,   2 running, 201 sleeping,   0 stopped,   0 zombie
> Cpu(s): 14.0%us,  1.9%sy,  0.0%ni, 84.1%id,  0.0%wa,  0.1%hi,  0.0%si, 
> 0.0%st Mem:   4150284k total,  1712896k used,  2437388k free,   376712k
> buffers Swap:  6080560k total,        0k used,  6080560k free,   523364k
> cached
> 
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  3749 root      20   0 67588  36m  11m S   57  0.9  13:02.61 Xorg
> 27653 merciadr  20   0  299m  68m  26m S   21  1.7   0:08.76 firefox-bin

(...)

> with a brand new firefox (i.e. virgin profile) on youtube.com; if I
> scroll really quickly, I get up to 106 % CPU usage by Xorg (with 0.9 %
> MEM).
> 
> As I said earlier, this problem seems to happen with some other apps
> too, e.g. the system monitor.

Mmm... interesting. Note there's also Xorg there, taking too much of your
CPU cycles. I've seen this before, Google will confirm:

http://bit.ly/LNMAzg

But if you say you experience the same problem with another applications, 
this points to a component that is shared between them, and I can only
think in Xorg and the VGA drivers. There's a additional "but" here and is
that as you are using Lenny, I can guess that none of these two could have
changed recently so the mistery still remains unless you installed "something"
recently :-)

>> Disable the flash plugin at all (and so the same foe whatever
>> additional version you can have installed, e.g., "gnash") and retry. It
>> looks weird seeing Firefox to render slowly a usual page like Youtube,
>> even more with flash player disabled :-?

> I just tried, using the plug-in menu. This has no influence, and it
> looks logical as the slowness problem is already encountered on the
> welcome page, which does not really contain flash stuff (these are just
> thumbnails)!

Well, yes, the Firefox start page shouldn't be problematic _unless_ you are
using the new feature that displays the latest visited sites in thumbnails ;-)

>> You can also run the same tests you are doing with Firefox but using a
>> different browser to compare both results.

> Yes. However, I think my problem is related to something other than
> Firefox. What about the System monitor problem that I explained before?

GNOME system monitor can become an intensive task, I mean, is not a good tool
to use to compare with, but you can try to reproduce the CPU pikes launching 
different applications (e.g., OOo writer, gedit, any Qt based app that you may
have installed, a java tool...).

Greetings,

-- 
Camaleón


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