Speedtest.net is quite a useful site and I enjoy testing the speed of my Internet provider. I use the services of both MWeb and Telkom and recently the Telkom lines have certainly been very spotty.
Some of the download speeds I get, and this is on a computer that is not being shared with anybody else, have been very low and on www.speedtest.net , I have discovered for example that my speed has been running as low as 0,4 mbps, on what is meant to be a 4 mbps line! In other words, I am running at 10% of the full speed!