[Bug 258997] New: KDE GUI unresponsive and very slow

[Caterpillar]

https://bugs.kde.org/show_bug.cgi?id=258997

           Summary: KDE GUI unresponsive and very slow
           Product: kde
           Version: 4.5
          Platform: Fedora RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: caterpillar at fastwebnet.it


Created an attachment (id=54200)
 --> (http://bugs.kde.org/attachment.cgi?id=54200)
xsession-errors

Version:           4.5 (using KDE 4.5.3) 
OS:                Linux

I was using the computer with a Fedora 14 64 bit and I was running VirtualBox
with Windows 7. Suddendly I got KDE very unresponsive, instead VirtualBox was
ok. After a few seconds KDE got completely freezed, and I had to halt the
computer by logging in shell with ctrl+alt+f2 and doing an halt command.
I rebooted but when I login into KDE, the transition images of the login load
at a distance of some minutes each one by the other. When KDE is finally
active, the gui is freezed.
I know that it is a problem of KDE because shell is ok, and when I was using
VirtualBox, the virtual machine was ok.

The computer is new and the rams are ok, I've tested them for 21 hours with
memetest86

I attach a xsession-errors. The bug is reproducible, so if you need other logs
please tell me.

Hardware:
Motherboard: Gigabyte 890FXA-UD5
CPU: AMD Phenom II X2 550
RAM: 4x2gb Corsair XMS 3 1333mhz DDR3
VGA: nVidia Geforce GTX 260 with nVidia drivers by rpmfusion repository
Sound board: Asus Xonar Essence ST

Reproducible: Always

Steps to Reproduce:
Just boot the computer and do a login

Actual Results:  
GUI freezed


I selected major severity because the entire system is not usuable

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