Very slow and unstable after update...

Hello!
After update yesterday, my Arch64 was very slow and unstable... Eclipse IDE crashes, Firefox uses +200mb and Xorg uses +15% of CPU. Xorg lags when I'm going to switch between virtual desktop in KDE... very strange!
Some confs below:
[root@Selene hlegius]# uname -a
Linux Selene 2.6.25-ARCH #1 SMP PREEMPT Sat Jun 14 17:44:19 CEST 2008 x86_64 Intel(R) Core(TM)2 Duo CPU T7100 @ 1.80GHz GenuineIntel GNU/Linux
[root@Selene hlegius]# free -m
total used free shared buffers cached
Mem: 3947 1121 2826 0 30 466
-/+ buffers/cache: 624 3322
Swap: 0 0 0
[root@Selene hlegius]# kde-config -v
Qt: 3.3.8b
KDE: 3.5.9
kde-config: 1.0
[root@Selene hlegius]# X -version
X.Org X Server 1.4.2
Release Date: 11 June 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.25-ARCH x86_64
Current Operating System: Linux Selene 2.6.25-ARCH #1 SMP PREEMPT Sat Jun 14 17:44:19 CEST 2008 x86_64
Build Date: 21 June 2008  11:53:34AM
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Module Loader present
Any ideas ?

Rexilion wrote:
I misread that the in kernel driver of v3.12 was working properly. THat way you can figure out what exact change broke performance by testing different development kernels.
There is an in-kernel driver in staging called rtl8192u. It received a lot of changes in v3.12. Maybe try v3.11 and see if that works?
it didnt work in kernel 3.12, but with https://aur.archlinux.org/packages/dkms-8192cu/ it worked perfect
in kernel 3.13 it is horrible both witht he stock driver or with the AUR package.

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