Lateral reasoning, maybe, but, in addition to the PPRuNe slowness I'm having serious problems with BBC News videos, which only run for five to six seconds before 'holding' for up to a minute then five to six seconds more.
So far I don't attribute this to the broadband connection (which seems fine on other URLs and also BBC text), however I've recently upgraded AVG from 7 to 8 (and this now seems to be integrated with my Firefox browser).
I haven't yet disabled AVG, but I offer this suspicion to others for comment . . .
InternetDestroyer is the same BTW, as is Opera.
No problems with Youtube.