KDE4 slow

[Clemens Eisserer]

QT-4 is double-buffered which itself poses a lot of overhead compared to QT-3.

I also found the default theme (oxygen) used by KDE4 to be a CPU
sucker. All the beautiful gradients come at a price (gradients are not
hw accelerated).
I now use the Windows theme (redmond) which feels a lot snappier (but
looks rather ugly).

- Clemens

2009/6/25, Hans-J. Ullrich <hans.ullrich at loop.de>:
> Am Donnerstag 25 Juni 2009 schrieb Alvaro Aguilera:
>> I think something about KDE4 should be re-engineered. The applications you
>> are continuously using (a file manager, kicker, window manager, menus,
>> etc.) should open/work instantaneously. Having to wait, even for 1 second,
>> has a psychological impact and degrades the overall experience.
>>
>> My computer is not _that_ old (laptop with 2 cores at 2ghz, 4gb ram and
>> intel 945 graphics) and I'm still using KDE3 because KDE4 feels very slow
>> in comparison to KDE3. The applications from KDE4 work great and fast,
>> when
>> they run outside KDE4, so the problem must reside at the window manager,
>> or
>> similar. It would be great to have a KDE4-lite version, without plasma,
>> and
>> with a very basic, very fast, window manager. Having kde3 and kde4
>> installed on the same machine is becoming increasingly a PITA, since there
>> are package-conflicts with some files, and sometimes they compete for
>> resources like the sound card...
>>
>>
>> I have the same, my computer is simply unuseable with KDE4.
>>
>> > Am Donnerstag, 25. Juni 2009 03:18:45 schrieb Michael Pyne:
>> > > In short, you just need to wait for the video driver support to catch
>> > > up
>> >
>> > to
>> >
>> > > allow compositing to work smoothly.
>> >
>> > My video drivers are not supported any more (NVIDIA) because the card is
>> > just
>> > to old. Does this mean that I'll never  have a fast running KDE4 on my
>> > computer?
>> >
>> > Karl
>
> Yes, same to me. My computer is a laptop (Aspire 7520G) with 2G Ram, Nvidia
> Geforce 8400 (512MB) and Debian-amd64 on it.
>
> KDE4 is also running very slow on it (in comparision to kde3), and I have no
> plasma effects or other special effects activated. Composite is deactivated
> in
> xorg.conf. Although it is still usuable, It is feeling like running Windows
> XP
> on a machine with 800MHz and 256MB Ram, which let XP run, but not smooth.
>
> But I do not want to mourne, as I think, the developers know about this
> problem well, and are working on it hard. IMO there is (as KDE4 is
> completely
> new code), a lot to improve in the code itself. Another reason, and this is
> my
> very personal opinion, might be the interference with old kde3-libs. So, if
> you take a closer look, you see two kdewallets (which is involved in kded)
> running: the old one and the new one.
>
> Additionally, there is a problem with a lot of kio_http processes (search
> after it in the bugreports), which is dramatically slowing down the machine
> (especially older ones).
>
> I think, the developers know of this, too, and as the background of kde is
> "to
> make a computer mure usable for all", they will aim to speedup KDE4 to the
> speed as in KDE3.
>
> Let us hope for the best and look forward!
>
> Cheers
>
> Hans-J. Ullrich
>
>
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