Your internet speed will vary on UFB, just as it did on ADSL. Sometimes it will rip along, other times it will go slower. This is the nature of the technology and the way the internet is built.
If you are downloading from New Zealand based websites you will be using the Orcon network and your speed should be nice and fast. BUT, if you are accessing and downloading from overseas websites, this uses international bandwidth and congestion can occur at busy times. This congestion will affect your speed, even on UFB.
If your speed has dropped – try testing again at a different time of day, and to different locations. If it’s still slow, drop us a line and we can look into it and run our fancy diagnostic tools.