12.2 - New Install - Very slow system

Hello.

something like http://forums.opensuse.org/english/get-technical-help-here/install-boot-login/479044-freeze-lock-ups-new-12-2-a.html

After a new install of 12.2, removing nouveau and installing the last nvidia driver 304-60, and updating the system, the system was very slow and unusable. It take 30 sec to 3 mn to execute a click.
So I reinstall it a second time. Same problem.
After one day without modifying any things the system run more comfortably.

BTW I have found that /etc/mtab is 0 byte long.

I am surprise that the swap is never used but should be actived :
/dev/disk/by-id/ata-HDT722516DLA380_VDB71BTCDG0BGC-part8 swap swap pri=0 0 0

linux-srv:~ # free
             total       used       free     shared    buffers     cached
Mem:       8190120    1376784    6813336          0      65208     631756
-/+ buffers/cache:     679820    7510300

Swap:     10249432          0   10249432
linux-srv:~ # 

linux-srv:~ # fdisk -l sdd
/dev/sdd8        63392553    83891429    10249438+  82  Linux swap / Solaris

linux-srv:~ # uname -a
Linux linux-srv 3.4.11-2.16-desktop #1 SMP PREEMPT Wed Sep 26 17:05:00 UTC 2012 (259fc87) x86_64 x86_64 x86_64 GNU/Linux

lspci show :
01:00.0 VGA compatible controller: NVIDIA Corporation NV41 [GeForce 6800 GS] (rev a2)

============ start debug info ============
libhd version 19.1 (x86-64) [7688]
using /var/lib/hardware
kernel version is 3.4
----- /proc/cmdline -----
  BOOT_IMAGE=/vmlinuz-3.4.11-2.16-desktop root=UUID=50e0073b-18f8-4ebe-82b6-82e649da3346 resume=/dev/disk/by-id/ata-HDT722516DLA380_VDB71BTCDG0BGC-part8 splash=silent quiet showopts
----- /proc/cmdline end -----

 DOS base memory: 640 kB
  Extended memory: 65472 kB (configured), 65472 kB (tested)
  Gfx adapter    : EGA, VGA, ... (with BIOS)
  FPU            : installed

Bi-processor AMD :

----- /proc/cpuinfo -----
  processor    : 0
  vendor_id    : AuthenticAMD
  cpu family    : 15
  model        : 107
  model name    : AMD Athlon(tm) 64 X2 Dual Core Processor 5000+
  stepping    : 1
  microcode    : 0x83
  cpu MHz        : 1000.000
  cache size    : 512 KB
  physical id    : 0
  siblings    : 2
  core id        : 0
  cpu cores    : 2
  apicid        : 0
  initial apicid    : 0
  fpu        : yes
  fpu_exception    : yes
  cpuid level    : 1
  wp        : yes
  flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch lbrv
  bogomips    : 2008.99
  TLB size    : 1024 4K pages
  clflush size    : 64
  cache_alignment    : 64
  address sizes    : 40 bits physical, 48 bits virtual
  power management: ts fid vid ttp tm stc 100mhzsteps

35: PCI 100.0: 0300 VGA compatible controller (VGA)
  [Created at pci.319]
  Unique ID: VCu0.PKJKcrLnm32
  Parent ID: _Znp.4xLmuLwp_n2
  SysFS ID: /devices/pci0000:00/0000:00:02.0/0000:01:00.0
  SysFS BusID: 0000:01:00.0
  Hardware Class: graphics card
  Model: "nVidia GeForce 6800 GS (0x00c0)"
  Vendor: pci 0x10de "nVidia Corporation"
  Device: pci 0x00c0 "GeForce 6800 GS (0x00c0)"
  SubVendor: pci 0x10de "nVidia Corporation"
  SubDevice: pci 0x0339 
  Revision: 0xa2
  Driver: "nouveau"
  Driver Modules: "drm"
  Memory Range: 0xfa000000-0xfaffffff (rw,non-prefetchable)
  Memory Range: 0xd0000000-0xdfffffff (ro,non-prefetchable)
  Memory Range: 0xfb000000-0xfbffffff (rw,non-prefetchable)
  Memory Range: 0xfc000000-0xfc01ffff (ro,non-prefetchable,disabled)
  IRQ: 18 (1306 events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v000010DEd000000C0sv000010DEsd00000339bc03sc00i00"
  Driver Info #0:
    XFree86 v4 Server Module: nv
  Driver Info #1:
    XFree86 v4 Server Module: nvidia
    3D Support: yes
  Config Status: cfg=no, avail=yes, need=no, active=unknown
  Attached to: #15 (PCI bridge)

So I would like to know what I am going tro do ?