I have experienced the same issue, zippy at home, but "glacial" (good analogy!) at work.

I havent investigated further, but I simply assumed it was the firewall weenies here at work throttling my empeg surfing (I check this board many times per day)

But then today, the skies opened and the and bbs rips down like it should, maybe a jelly-fish wandered into a fibre break on the sea floor? ;-)

Smoker_Man
#080000449 MkII - 36Gb Blue