[opensuse] 4GB computer slowdown

Hello,

I've recently upgraded my RAM to 4GB and since then, when the X server
starts, the computer slows down a lot - what I mean by slows down is
that:

- although there is some occasional hard disk activity, I never see
the KDE Desktop, I only get the mouse pointer and that's it
- if I start a console with Ctrl+Alt+F1, it takes about a minute to
see the command prompt from the moment I type my (correct) password
- if after logging in I use the Midnight Commander, it's response is
very slow and slurgish and navigation through folders is very slow

When I still had 2GB everything was ok. I'm using openSUSE 10.2 on a
Intel Core 2 Duo 1.86 Ghz, 4 MB L2 Cache, FSB 1066 Mhz / Intel DP965LT
motherboard / 4 x 1 GB Corsair DDR2 675 Mhz, 4-4-4-12 / ATI Radeon
EAX1300 256MB / WDC S-ATA II 250 GB HDD.

Booting the XEN kernel (second option in the bootloader) works (but no
ATI video driver is taken into consideration, it defaults to VESA
mode), but using the default one causes the above problem.

Could you please be as kind so as to give me a suggestion to fix this
issue? It's really frustrating, as Windows XP and Vista work ok (but
they don't see the entire 4GB, only 3.25 GB), but I would rather use
Linux instead (and hopefully have all 4GB available).

Thank you very much,
Alex
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