Well, I was warned

My ISP sent me an email last week to tell me they would be "working away to move your service onto a new, improved network."

They went on to say:

"On the day after the work is carried out, you may notice a little instability on your line. There may also be minor speed fluctuations for up to ten days (this usually only lasts for three days). This is because your broadband is establishing its optimal line speed on the new network."

They weren't joking. It has taken me ten minutes just to load one site!