PC speed

What generated my question was this: I belong to a forum and I am occasionally getting this report. "Connect to upstream server timeout". I disconnect and try again and get right in. It also happens on and off when I am posting. Someone advised it might be the speed of my PC. This is the only site I am having the problem with. BTW, I have no problem with youtube and videos. The other stuff I am not interested in.

My DSL - Express 384kbps-1.5mbps Download 128kbps-384kbps Upload