My internet connection is very variable. I play chess on the web. Sometimes it says excellent connection, low lag. Other times it says poor connection with a big lag, and then I often lose cos my moves don't get to the server! It can vary even within a minute..
I don't know if this is the same thing as line speed. I read the recent thread on this, and logged onto Ookla. It said I had a Ping of 28ms and download speed of 1.11 Mbps, though I don't know the significance of these. I think this was when the lag was low, so it's probably a lot slower at times.
Any advice would be welcome.