Why is my internet browser lagging?

Starting a few weeks ago my internet browser firefox has been lagging really badly. So bad it's coming to the point where I just want to shove a very pissed off live porcupine up my ***. I've tried doing virus scans with two different programs, reinstalling firefox and making sure there are no programs in... show more Starting a few weeks ago my internet browser firefox has been lagging really badly. So bad it's coming to the point where I just want to shove a very pissed off live porcupine up my ***. I've tried doing virus scans with two different programs, reinstalling firefox and making sure there are no programs in the background that could slow it down. What actually happens is the browser will run fine for about 5 seconds... then freeze for 5 seconds over and over. I've tried restarting the browser, restarting the modem and restarting the computer but nothing works. Does anyone have any advice?
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