Difficulties with internet speed (nothing to do with connection)

The internet on my macbook has been running extremely slowly in comparison to when I first bought it. I know its not relevant to internet connection itself because all other lap tops in my house and at university run normally. I've tried restarting it several times and I have cleaned the hard drive several times so I don't think its an issue with memory or anything like that.
I have also emptied the cache and I've checked the console log (though to be honest I have no idea what I'm looking at there)
Any ideas?

If your router is supplying full protocol speed, you don't say what your router protocol is, 802.11a/b/g/n?, but if your other systems are running at the full speed and you have done good housekeeping chores, perhaps something is wrong with the AirPort circuitry in the MacBook...can you get to an Apple genius bar and have the techs run some diagnostics to test the AirPort circuit?  They can tell if something is amiss.

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