I ran a At&t high speed internet throughout speed test and it was Download=1.691 mbps and my upload =439.41 kbps

My Mps 2.5MB=11 sec. So I know that I've got good connection. I've cleared everything, but I can't figure out why my browser is sooooo slow and so is my downloads. What happened? I get an error message if I use AT&T Self support and the AT&T tech said that he never uses that, so he didn't know what it meant