Difficult to see what is happening when a connection is generating traffic, connection needs to be idle to really comment.

With VM you are contending with people in the local area, and others who may have left things running, and there is usually only capacity for a few 100 Meg customers to be doing a lot.

Trading updates are usually low volume, but latency dependent, in which case a more business focussed provider may be better. Have monitored the volume of traffic you use? The 100 Meg service may be no faster for your trading, than VM's 10 Meg if its low volumes of data