Arch turning slow with time

Hello! I re-installed arch linux on my computer using the Beginners Guide from the wiki. But now when I use the computer i turns slow over time, I'm talking if I leave it on for 3 hours+. By slow I mean that I am typing this sentence, and I'm expecting to see it 3 seconds after pressing the ".". It's fine when I reboot, running blazingly fast but after that 3 hour mark, happens no matter what I use to computer for. It's weird as the first time I installed arch this didn't happen, after having searched high and low on Google I have no re-installed the OS three times (every time with the same problem). I would love to add some files explaining the problem, but I really have no idea where to even begin looking, so I'll just list some specs.
I'm running:
Gnome
64 bit arch, not using testing or unstable
Normal use would be cmus, libre office and chromium running.
Hardware wise everything should be OK, when in windows I'm running battlefield 3 and other hardware hungry games without problems, also the same problem does not happen in windows. Let it be noted that Windows is on a harddrive, and arch is on a SSD drive (120 GB Kingston HyperX)
I have checked my hostname, rc.conf etc and they all seem to be OK, any suggestions?

Hello! The problem is still persistent, I've just "lived with" ubuntu for some time as I've had my exam period + two new jobs so there has not been time.
It is a desktop, with rather powerful hardware (running most modern games on full without problems)
I did check /etc/hosts and it matched with /etc/rc.conf.
Again it's blazing after a reboot, but a few hours on (like now) it's very, very slow. even typing text is laggy.
http://bildr.no/image/1200991.jpeg <- htop
Since last time I posted I have re-installed arch, re-installing did not change any thing.
Hardware:
Intel i5 2500k
Nvidia GeForce 5600 (with the nvidia + nvidia-utils driver)
ASUS P8Z68-V motherboard
Windows and Ubuntu is both running fine, but really, I'd much prefer using arch.
again, thank you for all replies : )
I run "pacman -Syu" every day.

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