Internet speed starts out fast but quickly gets slower and slower

[kevinlevi]

I have AT&T Broadband cable connection with ME os, AMD750 processor, 512ram. When I connect to the internet the speed starts out fast but within 5 minutes it gradually gets slower and slower. I didn't have this problem in my old house but when we moved a few miles down the road it started doing this. Does anybody know why this might be doing this?

 

[Del]

What are you doing when you notice it slowing down? Just surfing, gaming?
Are you running a firewall, what antivirus software are you using?