Just clean installed Mountain Lion but MBP running extremely, extremely slow

Four days ago I opened up my MBP to find it running at a snail's pace. The change had happened overnight. Five days ago it was blazing fast, the next day every application took 20 minutes to start up, the rainbow circle would appear every time I would do the simplest of tasks; it was a nightmare.
First, I thought there was some sort of malware infecting my system, so I scanned the computer with Sophos, iAntivirus and ClamXav. This process took the better part of a day because everything was so slow. The results were all clear. Next, I decided to repair permissions, empty the cache, and use CCleaner. No improvement.
Then, I felt there was a problem with the OS I was running; Lion. So I decided to get Mountain Lion. I took the install DMG file and used Lion Diskmaker to create a USB install disk. I then booted with 'Option', erased Macintosh HD, and installed Mountain Lion. Installation was without any problems, except for the fact that it was quite slow and the Welcome steps also took a very long time to complete, with the rainbow circle constantly appearing.
This now leads me to believe that there might be some sort of hardware issue. If this is so, or if you suspect any other sort of issue, how would I go about identifying and fixing it? Please help, because even typing this problem out has taken me a long time due to the MBP constantly getting stuck and slow-ey.
P.S. I've also noticed that the longer I keep an application running, the smoother it seems to run, but the difference is very small.
MBP 13 inch, Late 2011
Processor: Intel Core i7 2.8 Ghz
Memory: 4GB 1333 MHz DDR3
Graphics: Intel HD Graphics 3000 384 MB
Software: OS X 10.8 Mountain Lion
On the memory slot page, both 2 GB memory slots are said to be in use, so i don't think any memory has been dislodged...
Here is my system log:
http://pastebin.com/EY34q5Bf

Make a "Genius" appointment at an Apple Store, or go to another authorized service center.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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