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I'm having serious speed problems with my laptop lately. I had been experiencing periodic lock ups using Windows 7, so I switched to Ubuntu (Raring, 13.04). I eventually install xfce in order to help keep it fast, but it's still locking up periodically. The only indication I get that the computer is doing something excessive is the hard drive light on the computer, my CPU loads and RAM loads remain under 50%, and iotop doesn't show much of anything going on even though the light turns on for extended periods of time, even when nothing is happening. My hdparm levels are I'll be torrenting 3 or 4 files, and running firefox with one browser window (with only conky & dropbox running in addition) and the firefox window (chrome does the same thing) will stop loading, the programs will lock up (the mouse remains mobile).
I have 3 gigs of RAM, Intel(R) Pentium(R) CPU U5600 @ 1.33GHz, and a 500g hard drive with two partitions, neither of which is more than 75% full. I have run an abundance of tests and the only thing that turned up anything significant was running Ubuntu's System test which returned

memory/info FAILED  FAIL: Difference is 339046400 bytes (10.53%) and greater than the 10% threshold. /proc/meminfo reports: 2882179072 kB dmi reports: 3221225472 kB

Please let me know what I can do to get rid of this problem, I'm relatively new to ubuntu, and I'm completely lost as to why this relatively new computer is giving me so many speed problems with so little running.

also, my hdparm output is: /dev/sda: Timing cached reads: 3870 MB in 2.00 seconds = 1935.23 MB/sec Timing buffered disk reads: 30 MB in 3.02 seconds = 9.93 MB/sec

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